diff --git a/frontend/job_manager.py b/frontend/job_manager.py
index b840350..8eda8d9 100644
--- a/frontend/job_manager.py
+++ b/frontend/job_manager.py
@@ -8,6 +8,7 @@ from dataclasses import dataclass, field
 from functools import partial
 from PIL.Image import Image
 import uuid
+import traceback
 
 
 @dataclass(eq=True, frozen=True)
@@ -231,7 +232,7 @@ class JobManager:
             outputs = job_info.func(*job_info.inputs, job_info=job_info)
         except Exception as e:
             job_info.job_status = f"Error: {e}"
-            print(f"Exception processing job {job_info}: {e}")
+            print(f"Exception processing job {job_info}: {e}\n{traceback.format_exc()}")
             outputs = []
 
         # Filter the function output for any removed outputs
diff --git a/webui.py b/webui.py
index 2fbfa56..8f9b111 100644
--- a/webui.py
+++ b/webui.py
@@ -782,7 +782,7 @@ def process_images(
         uses_random_seed_loopback=False, sort_samples=True, write_info_files=True, write_sample_info_to_log_file=False, jpg_sample=False,
         variant_amount=0.0, variant_seed=None,imgProcessorTask=False, job_info: JobInfo = None):
     """this is the main loop that both txt2img and img2img use; it calls func_init once inside all the scopes and func_sample once per batch"""
-    assert prompt is not None
+    prompt = prompt or ''
     torch_gc()
     # start time after garbage collection (or before?)
     start_time = time.time()
@@ -1508,7 +1508,7 @@ def split_weighted_subprompts(input_string, normalize=True):
     weight_sum = sum(map(lambda x: x[1], parsed_prompts))
     if weight_sum == 0:
         print("Warning: Subprompt weights add up to zero. Discarding and using even weights instead.")
-        equal_weight = 1 / len(parsed_prompts)
+        equal_weight = 1 / (len(parsed_prompts) or 1)
         return [(x[0], equal_weight) for x in parsed_prompts]
     return [(x[0], x[1] / weight_sum) for x in parsed_prompts]