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fix: improve error message when node type is missing #12194

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Merged
comfyanonymous merged 1 commit into from
Feb 1, 2026
Merged

fix: improve error message when node type is missing #12194

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24 changes: 18 additions & 6 deletions execution.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1000,22 +1000,34 @@ async def validate_prompt(prompt_id, prompt, partial_execution_list: Union[list[
outputs = set()
for x in prompt:
if 'class_type' not in prompt[x]:
node_data = prompt[x]
node_title = node_data.get('_meta', {}).get('title')
error = {
"type": "invalid_prompt",
"message": "Cannot execute because a node is missing the class_type property.",
"type": "missing_node_type",
"message": f"Node '{node_title or f'ID #{x}'}' has no class_type. The workflow may be corrupted or a custom node is missing.",
"details": f"Node ID '#{x}'",
"extra_info": {}
"extra_info": {
"node_id": x,
"class_type": None,
"node_title": node_title
}
}
return (False, error, [], {})

class_type = prompt[x]['class_type']
class_ = nodes.NODE_CLASS_MAPPINGS.get(class_type, None)
if class_ is None:
node_data = prompt[x]
node_title = node_data.get('_meta', {}).get('title', class_type)
error = {
"type": "invalid_prompt",
"message": f"Cannot execute because node {class_type} does not exist.",
"type": "missing_node_type",
"message": f"Node '{node_title}' not found. The custom node may not be installed.",
"details": f"Node ID '#{x}'",
"extra_info": {}
"extra_info": {
"node_id": x,
"class_type": class_type,
"node_title": node_title
}
}
return (False, error, [], {})

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