diff --git a/sample/profiles/stackprof/stackprof-last-frame-no-name.json b/sample/profiles/stackprof/stackprof-last-frame-no-name.json
new file mode 100644
index 0000000..3f73ce2
--- /dev/null
+++ b/sample/profiles/stackprof/stackprof-last-frame-no-name.json
@@ -0,0 +1 @@
+{"version":1.2,"mode":"object","interval":1,"samples":103,"gc_samples":0,"missed_samples":0,"metadata":{},"frames":{"4317464320":{"name":"block in <main>","file":"/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb","line":21,"total_samples":103,"samples":1,"edges":{"4379033920":102},"lines":{"23":[1,1],"22":[102,0]}},"4379035920":{"name":"StackProf.run","file":"<cfunc>","line":null,"total_samples":103,"samples":0,"edges":{"4317464320":103}},"4376547240":{"name":"<main>","file":"/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb","total_samples":103,"samples":0,"edges":{"4379035920":103},"lines":{"21":[103,0]}},"4317728280":{"name":"<main>","file":"../../alexcoco/speedscope/sample/programs/ruby/object.rb","total_samples":103,"samples":0,"edges":{"4376547240":103}},"4379033920":{"name":"Object#a","file":"/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb","line":4,"total_samples":102,"samples":2,"edges":{"4317869400":102,"4379033880":5,"4379033840":95},"lines":{"6":[6,1],"5":[102,0],"8":[1,1],"7":[95,0]}},"4317869400":{"name":"Range#each","file":"<cfunc>","line":null,"total_samples":102,"samples":0,"edges":{"4379033920":102,"4379033840":95}},"4379033880":{"name":"Object#b","file":"/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb","line":11,"total_samples":5,"samples":1,"edges":{"4318054440":4},"lines":{"12":[5,1]}},"4318054440":{"name":"Class#new","file":"<cfunc>","line":null,"total_samples":4,"samples":4},"4379033840":{"name":"Object#c","file":"/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb","line":15,"total_samples":95,"samples":2,"edges":{"4317869400":95,"4317868920":37,"4317563560":20,"4317922760":36},"lines":{"17":[95,2],"16":[95,0]}},"4317868920":{"name":"Range#to_a","file":"<cfunc>","line":null,"total_samples":37,"samples":1,"edges":{"4379016640":36}},"4379016640":{"name":"Enumerable#to_a","file":"<cfunc>","line":null,"total_samples":36,"samples":36},"4317563560":{"name":"Array#sample","file":"<internal:array>","line":60,"total_samples":20,"samples":20,"lines":{"60":[1,1],"68":[19,19]}},"4317922760":{"file":"<cfunc>","line":null,"total_samples":36,"samples":36}},"raw":[4,4317728280,4376547240,4379035920,4317464320,1,7,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,1,8,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033880,1,9,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033880,4318054440,2,7,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,1,10,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,1,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317868920,1,12,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317868920,4379016640,2,10,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,1,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317563560,3,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317922760,2,12,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317868920,4379016640,2,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317563560,1,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317922760,2,12,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317868920,4379016640,2,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317563560,1,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317922760,2,12,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317868920,4379016640,2,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317563560,1,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317922760,2,12,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317868920,4379016640,2,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317563560,1,11,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317922760,2,12,4317728280,4376547240,4379035920,4317464320,4379033920,4317869400,4379033920,4379033840,4317869400,4379033840,4317868920,4379016640,2,11,4317728280,4376547240,4379035920,4317464320,43790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diff --git a/src/import/__snapshots__/stackprof.test.ts.snap b/src/import/__snapshots__/stackprof.test.ts.snap
index 3888a1b..319f73a 100644
--- a/src/import/__snapshots__/stackprof.test.ts.snap
+++ b/src/import/__snapshots__/stackprof.test.ts.snap
@@ -1046,6 +1046,201 @@ exports[`importFromStackprof object mode: indexToView 1`] = `0`;
 
 exports[`importFromStackprof object mode: profileGroup.name 1`] = `"object-stackprof.json"`;
 
+exports[`importFromStackprof when a profile has a frame with no name 1`] = `
+Object {
+  "frames": Array [
+    Frame {
+      "col": undefined,
+      "file": "../../alexcoco/speedscope/sample/programs/ruby/object.rb",
+      "key": 4317728280,
+      "line": undefined,
+      "name": "<main>",
+      "selfWeight": 0,
+      "totalWeight": 103,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb",
+      "key": 4376547240,
+      "line": undefined,
+      "name": "<main>",
+      "selfWeight": 0,
+      "totalWeight": 103,
+    },
+    Frame {
+      "col": undefined,
+      "file": "<cfunc>",
+      "key": 4379035920,
+      "line": null,
+      "name": "StackProf.run",
+      "selfWeight": 0,
+      "totalWeight": 103,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb",
+      "key": 4317464320,
+      "line": 21,
+      "name": "block in <main>",
+      "selfWeight": 1,
+      "totalWeight": 103,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb",
+      "key": 4379033920,
+      "line": 4,
+      "name": "Object#a",
+      "selfWeight": 2,
+      "totalWeight": 102,
+    },
+    Frame {
+      "col": undefined,
+      "file": "<cfunc>",
+      "key": 4317869400,
+      "line": null,
+      "name": "Range#each",
+      "selfWeight": 0,
+      "totalWeight": 102,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb",
+      "key": 4379033880,
+      "line": 11,
+      "name": "Object#b",
+      "selfWeight": 1,
+      "totalWeight": 5,
+    },
+    Frame {
+      "col": undefined,
+      "file": "<cfunc>",
+      "key": 4318054440,
+      "line": null,
+      "name": "Class#new",
+      "selfWeight": 4,
+      "totalWeight": 4,
+    },
+    Frame {
+      "col": undefined,
+      "file": "/Users/alex/src/github.com/alexcoco/speedscope/sample/programs/ruby/object.rb",
+      "key": 4379033840,
+      "line": 15,
+      "name": "Object#c",
+      "selfWeight": 2,
+      "totalWeight": 95,
+    },
+    Frame {
+      "col": undefined,
+      "file": "<cfunc>",
+      "key": 4317868920,
+      "line": null,
+      "name": "Range#to_a",
+      "selfWeight": 1,
+      "totalWeight": 37,
+    },
+    Frame {
+      "col": undefined,
+      "file": "<cfunc>",
+      "key": 4379016640,
+      "line": null,
+      "name": "Enumerable#to_a",
+      "selfWeight": 36,
+      "totalWeight": 36,
+    },
+    Frame {
+      "col": undefined,
+      "file": "<internal:array>",
+      "key": 4317563560,
+      "line": 60,
+      "name": "Array#sample",
+      "selfWeight": 20,
+      "totalWeight": 20,
+    },
+    Frame {
+      "col": undefined,
+      "file": "<cfunc>",
+      "key": 4317922760,
+      "line": null,
+      "name": "(unknown)",
+      "selfWeight": 36,
+      "totalWeight": 36,
+    },
+  ],
+  "name": "stackprof-last-frame-no-name.json",
+  "stacks": Array [
+    "<main>;<main>;StackProf.run;block in <main> 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#b 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#b;Class#new 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 3",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#b;Class#new 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#b;Class#new 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Range#to_a;Enumerable#to_a 2",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;Array#sample 1",
+    "<main>;<main>;StackProf.run;block in <main>;Object#a;Range#each;Object#a;Object#c;Range#each;Object#c;(unknown) 2",
+  ],
+}
+`;
+
+exports[`importFromStackprof when a profile has a frame with no name: indexToView 1`] = `0`;
+
+exports[`importFromStackprof when a profile has a frame with no name: profileGroup.name 1`] = `"stackprof-last-frame-no-name.json"`;
+
 exports[`importFromStackprof: indexToView 1`] = `0`;
 
 exports[`importFromStackprof: profileGroup.name 1`] = `"simple-stackprof.json"`;
diff --git a/src/import/stackprof.test.ts b/src/import/stackprof.test.ts
index a5f5b20..32624ba 100644
--- a/src/import/stackprof.test.ts
+++ b/src/import/stackprof.test.ts
@@ -7,3 +7,7 @@ test('importFromStackprof', async () => {
 test('importFromStackprof object mode', async () => {
   await checkProfileSnapshot('./sample/profiles/stackprof/object-stackprof.json')
 })
+
+test('importFromStackprof when a profile has a frame with no name', async () => {
+  await checkProfileSnapshot('./sample/profiles/stackprof/stackprof-last-frame-no-name.json')
+})
diff --git a/src/import/stackprof.ts b/src/import/stackprof.ts
index bbc62fa..0ace853 100644
--- a/src/import/stackprof.ts
+++ b/src/import/stackprof.ts
@@ -4,7 +4,7 @@ import {Profile, FrameInfo, StackListProfileBuilder} from '../lib/profile'
 import {TimeFormatter} from '../lib/value-formatters'
 
 interface StackprofFrame {
-  name: string
+  name?: string
   file?: string
   line?: number
 }
@@ -34,10 +34,16 @@ export function importFromStackprof(stackprofProfile: StackprofProfile): Profile
     let stack: FrameInfo[] = []
     for (let j = 0; j < stackHeight; j++) {
       const id = raw[i++]
-      stack.push({
+      let frameName = frames[id].name;
+      if (frameName == null) {
+        frameName = '(unknown)';
+      }
+      const frame = {
         key: id,
         ...frames[id],
-      })
+        name: frameName,
+      }
+      stack.push(frame)
     }
     if (stack.length === 1 && stack[0].name === '(garbage collection)') {
       stack = prevStack.concat(stack)