--cache-ram exception #10631
Description
Custom Node Testing
- I have tried disabling custom nodes and the issue persists (see how to disable custom nodes if you need help)
Expected Behavior
--cache-ram 32 should work.
This relates to #10454 (cc @rattus128)
Actual Behavior
An exception is encountered Exception in thread Thread-2 (prompt_worker) when running a wan workflow.
Steps to Reproduce
Start with --cache-ram 32 & run a wan 14B workflow.
Debug Logs
Total VRAM 16368 MB, total RAM 64218 MB
pytorch version: 2.9.0+rocm6.4
AMD arch: gfx1100
ROCm version: (6, 4)
Set vram state to: NORMAL_VRAM
Device: cuda:0 AMD Radeon RX 7900 GRE : native
Using Flash Attention
Python version: 3.13.7 (main, Aug 15 2025, 12:34:02) [GCC 15.2.1 20250813]
ComfyUI version: 0.3.67
ComfyUI frontend version: 1.28.8
...
Exception in thread Thread-2 (prompt_worker):
Traceback (most recent call last):
File /usr/lib/python3.13/threading.py, line 1043, in _bootstrap_inner
self.run()
~~~~~~~~^^
File /usr/lib/python3.13/threading.py, line 994, in run
self._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File /home/alex/ComfyUI/main.py, line 202, in prompt_worker
e.execute(item[2], prompt_id, extra_data, item[4])
~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File /home/alex/ComfyUI/execution.py, line 664, in execute
asyncio.run(self.execute_async(prompt, prompt_id, extra_data, execute_outputs))
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File /usr/lib/python3.13/asyncio/runners.py, line 195, in run
return runner.run(main)
~~~~~~~~~~^^^^^^
File /usr/lib/python3.13/asyncio/runners.py, line 118, in run
return self._loop.run_until_complete(task)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File /usr/lib/python3.13/asyncio/base_events.py, line 725, in run_until_complete
return future.result()
~~~~~~~~~~~~~^^
File /home/alex/ComfyUI/execution.py, line 720, in execute_async
self.caches.outputs.poll(ram_headroom=self.cache_args[ram])
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File /home/alex/ComfyUI/comfy_execution/caching.py, line 411, in poll
scan_list_for_ram_usage(outputs)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File /home/alex/ComfyUI/comfy_execution/caching.py, line 402, in scan_list_for_ram_usage
for output in outputs:
^^^^^^^
TypeError: 'NoneType' object is not iterableOther
No response