diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73e8f9102e1..d10224a316b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,8 +3,11 @@
 #### Enso IDE
 
 - ["Add node" button is not obscured by output port][10433]
+- [Numeric Widget does not accept non-numeric input][10457]. This is to prevent
+  node being completely altered by accidental code put to the widget.
 
 [10433]: https://github.com/enso-org/enso/pull/10443
+[10457]: https://github.com/enso-org/enso/pull/10457
 
 #### Enso Enso Standard Library
 
diff --git a/app/gui2/rust-ffi/src/lib.rs b/app/gui2/rust-ffi/src/lib.rs
index e33e1400c13..55ece57b997 100644
--- a/app/gui2/rust-ffi/src/lib.rs
+++ b/app/gui2/rust-ffi/src/lib.rs
@@ -37,6 +37,22 @@ pub fn is_ident_or_operator(code: &str) -> u32 {
     }
 }
 
+#[wasm_bindgen]
+pub fn is_numeric_literal(code: &str) -> bool {
+    let parsed = PARSER.with(|parser| parser.run(code));
+    let enso_parser::syntax::tree::Variant::BodyBlock(body) = *parsed.variant else { return false };
+    let [stmt] = &body.statements[..] else { return false };
+    stmt.expression.as_ref().map_or(false, |expr| match &*expr.variant {
+        enso_parser::syntax::tree::Variant::Number(_) => true,
+        enso_parser::syntax::tree::Variant::UnaryOprApp(app) =>
+            app.opr.code == "-"
+                && app.rhs.as_ref().map_or(false, |rhs| {
+                    matches!(*rhs.variant, enso_parser::syntax::tree::Variant::Number(_))
+                }),
+        _ => false,
+    })
+}
+
 #[wasm_bindgen(start)]
 fn main() {
     console_error_panic_hook::set_once();
diff --git a/app/gui2/shared/ast/ffi.ts b/app/gui2/shared/ast/ffi.ts
index 8ff6078fc60..d0903325f9f 100644
--- a/app/gui2/shared/ast/ffi.ts
+++ b/app/gui2/shared/ast/ffi.ts
@@ -6,7 +6,12 @@
 
 import { createXXHash128 } from 'hash-wasm'
 import type { IDataType } from 'hash-wasm/dist/lib/util'
-import init, { is_ident_or_operator, parse, parse_doc_to_json } from '../../rust-ffi/pkg/rust_ffi'
+import init, {
+  is_ident_or_operator,
+  is_numeric_literal,
+  parse,
+  parse_doc_to_json,
+} from '../../rust-ffi/pkg/rust_ffi'
 import { assertDefined } from '../util/assert'
 import { isNode } from '../util/detect'
 
@@ -37,4 +42,4 @@ export async function initializeFFI(path?: string | undefined) {
 // await initializeFFI()
 
 /* eslint-disable-next-line camelcase */
-export { is_ident_or_operator, parse_doc_to_json, parse as parse_tree }
+export { is_ident_or_operator, is_numeric_literal, parse_doc_to_json, parse as parse_tree }
diff --git a/app/gui2/shared/ast/ffiPolyglot.ts b/app/gui2/shared/ast/ffiPolyglot.ts
index 8fb372672c8..7dd6c3b990f 100644
--- a/app/gui2/shared/ast/ffiPolyglot.ts
+++ b/app/gui2/shared/ast/ffiPolyglot.ts
@@ -12,10 +12,17 @@ declare global {
   function parse_tree(code: string): Uint8Array
   function parse_doc_to_json(docs: string): string
   function is_ident_or_operator(code: string): number
+  function is_numeric_literal(code: string): boolean
   function xxHash128(input: IDataType): string
 }
 
 export async function initializeFFI(_path?: string | undefined) {}
 
 /* eslint-disable-next-line camelcase */
-export const { is_ident_or_operator, parse_doc_to_json, parse_tree, xxHash128 } = globalThis
+export const {
+  is_ident_or_operator,
+  is_numeric_literal,
+  parse_doc_to_json,
+  parse_tree,
+  xxHash128,
+} = globalThis
diff --git a/app/gui2/shared/ast/tree.ts b/app/gui2/shared/ast/tree.ts
index 757fa775949..1f90f1b84c3 100644
--- a/app/gui2/shared/ast/tree.ts
+++ b/app/gui2/shared/ast/tree.ts
@@ -32,6 +32,7 @@ import type { SourceRangeEdit } from '../util/data/text'
 import { allKeys } from '../util/types'
 import type { ExternalId, VisualizationMetadata } from '../yjsModel'
 import { visMetadataEquals } from '../yjsModel'
+import { is_numeric_literal } from './ffi'
 import * as RawAst from './generated/ast'
 import {
   applyTextEditsToAst,
@@ -1825,6 +1826,10 @@ export class MutableNumericLiteral extends NumericLiteral implements MutableAst
 export interface MutableNumericLiteral extends NumericLiteral, MutableAst {}
 applyMixins(MutableNumericLiteral, [MutableAst])
 
+export function isNumericLiteral(code: string) {
+  return is_numeric_literal(code)
+}
+
 /** The actual contents of an `ArgumentDefinition` are complex, but probably of more interest to the compiler than the
  *  GUI. We just need to represent them faithfully and create the simple cases. */
 type ArgumentDefinition<T extends TreeRefs = RawRefs> = (T['ast'] | T['token'])[]
diff --git a/app/gui2/src/components/GraphEditor/widgets/WidgetNumber.vue b/app/gui2/src/components/GraphEditor/widgets/WidgetNumber.vue
index eddcf303454..74f53421462 100644
--- a/app/gui2/src/components/GraphEditor/widgets/WidgetNumber.vue
+++ b/app/gui2/src/components/GraphEditor/widgets/WidgetNumber.vue
@@ -10,9 +10,9 @@ import { computed, ref, type ComponentInstance } from 'vue'
 const props = defineProps(widgetProps(widgetDefinition))
 const inputComponent = ref<ComponentInstance<typeof NumericInputWidget>>()
 
-function setValue(value: number | string) {
+function setValue(value: string | undefined) {
   props.onUpdate({
-    portUpdate: { value: value.toString(), origin: props.input.portId },
+    portUpdate: { value, origin: props.input.portId },
   })
 }
 
diff --git a/app/gui2/src/components/widgets/NumericInputWidget.vue b/app/gui2/src/components/widgets/NumericInputWidget.vue
index 504ecdc06f9..f1fcac888a0 100644
--- a/app/gui2/src/components/widgets/NumericInputWidget.vue
+++ b/app/gui2/src/components/widgets/NumericInputWidget.vue
@@ -1,5 +1,6 @@
 <script setup lang="ts">
 import { usePointer } from '@/composables/events'
+import { isNumericLiteral } from 'shared/ast/tree'
 import { computed, ref, watch, type CSSProperties, type ComponentInstance } from 'vue'
 import AutoSizedInput from './AutoSizedInput.vue'
 
@@ -9,7 +10,7 @@ const props = defineProps<{
   limits?: { min: number; max: number } | undefined
 }>()
 const emit = defineEmits<{
-  'update:modelValue': [modelValue: number | string]
+  'update:modelValue': [modelValue: string | undefined]
   blur: []
   focus: []
   input: [content: string]
@@ -21,6 +22,14 @@ const MIN_CONTENT_WIDTH = 56
 
 // Edited value reflects the `modelValue`, but does not update it until the user defocuses the field.
 const editedValue = ref('')
+// Last value which is a parseable number. It's a string, because the Enso number literals differ from js
+// representations.
+const lastValidValue = ref<string>()
+watch(editedValue, (newValue) => {
+  if (newValue == '' || isNumericLiteral(newValue)) {
+    lastValidValue.value = newValue
+  }
+})
 const valueString = computed(() => (props.modelValue != null ? props.modelValue.toString() : ''))
 watch(valueString, (newValue) => (editedValue.value = newValue), { immediate: true })
 const inputFieldActive = ref(false)
@@ -91,13 +100,14 @@ const inputStyle = computed<CSSProperties>(() => {
 })
 
 function emitUpdate() {
-  if (valueString.value !== editedValue.value) {
-    emit('update:modelValue', editedValue.value)
+  if (valueString.value !== lastValidValue.value) {
+    emit('update:modelValue', lastValidValue.value == '' ? undefined : lastValidValue.value)
   }
 }
 
 function blurred() {
   inputFieldActive.value = false
+  editedValue.value = lastValidValue.value?.toString() ?? ''
   emit('blur')
   emitUpdate()
 }