{"record":{"id":"2df21cf23b1d5128","repo":"langchain-ai/langgraph","slug":"received-no-input-writes-for-self-input-channels","errorCode":null,"errorMessage":"Received no input writes for {self.input_channels}","messagePattern":"Received no input writes for (.+?)","errorType":"exception","errorClass":"InvalidUpdateError","httpStatus":null,"severity":"error","filePath":"libs/langgraph/langgraph/pregel/main.py","lineNumber":1795,"sourceCode":"                        },\n                        get_new_channel_versions(\n                            checkpoint_previous_versions,\n                            checkpoint[\"channel_versions\"],\n                        ),\n                    )\n\n                    # store the writes\n                    checkpointer.put_writes(\n                        next_config,\n                        input_writes,\n                        str(uuid5(UUID(checkpoint[\"id\"]), INPUT)),\n                    )\n\n                    return patch_checkpoint_map(\n                        next_config, saved.metadata if saved else None\n                    )\n                else:\n                    raise InvalidUpdateError(\n                        f\"Received no input writes for {self.input_channels}\"\n                    )\n\n            # copy checkpoint\n            if as_node == \"__copy__\":\n                if len(updates) > 1:\n                    raise InvalidUpdateError(\n                        \"Cannot copy checkpoint with multiple updates\"\n                    )\n\n                if saved is None:\n                    raise InvalidUpdateError(\"Cannot copy a non-existent checkpoint\")\n\n                next_checkpoint = create_checkpoint(checkpoint, None, step)\n\n                # copy checkpoint\n                next_config = checkpointer.put(\n                    saved.parent_config","sourceCodeStart":1777,"sourceCodeEnd":1813,"githubUrl":"https://github.com/langchain-ai/langgraph/blob/38031739e551638e373fb553453256c23feeb41f/libs/langgraph/langgraph/pregel/main.py#L1777-L1813","documentation":"Error \"Received no input writes for {self.input_channels}\" thrown in langchain-ai/langgraph.","triggerScenarios":"Thrown at libs/langgraph/langgraph/pregel/main.py:1795 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"38031739e551638e373fb553453256c23feeb41f","analyzedAt":"2026-08-26T18:02:49.312Z","schemaVersion":2},"datasetVersion":"2026-08-26T21:11:00.512Z"}