Error4 reports
Fix WorkflowRuntimeError
in LlamaIndex
✅ Solution
WorkflowRuntimeError in LlamaIndex usually arises from unexpected empty messages, validation failures, or errors within individual steps (agents, tools) during workflow execution. To resolve it, carefully inspect the error message for clues on the source (step name, validation issue) and add robust error handling within those steps, ensuring they always return valid outputs or raise more descriptive exceptions if a step fails. Validate agent instructions and tool input/output schemas.
Related Issues
Real GitHub issues where developers encountered this error:
[Bug]: WorkflowRuntimeError: Got empty message when running ReActAgentSep 23, 2025
[Bug]: Workflow Error Span is not available after the Custom errors thrownSep 19, 2025
[Bug]: WorkflowRuntimeError: Error in step 'run_agent_step': 1 validation error for AgentStreamSep 12, 2025
[Bug]: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa8 in position 4: invalid utf-8Aug 18, 2025
Timeline
First reported:Aug 18, 2025
Last reported:Sep 23, 2025