and not None i guess

action.py

@@ -12,7 +12,7 @@ class WfRunStatus(Enum):
 def get_comfy_process():
     comfy_processes = []
     process_list = list(psutil.process_iter(['pid', 'exe', 'cmdline']))
-    python_processes = [proc for proc in process_list if 'python' in proc.info['exe'].lower()]
+    python_processes = [proc for proc in process_list if proc.info['exe'] is not None and 'python' in proc.info['exe'].lower()]
     for process in python_processes:
         cmdline = process.info['cmdline']
         if cmdline and 'main.py' in ' '.join(cmdline):