{"record":{"id":"7ac878a8f475b3d6","repo":"langchain-ai/langgraph","slug":"unknown-operation-type-type-op","errorCode":null,"errorMessage":"Unknown operation type: {type(op)}","messagePattern":"Unknown operation type: (.+?)","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"libs/checkpoint/langgraph/checkpoint/store/memory/__init__.py","lineNumber":400,"sourceCode":null,"sourceCodeStart":null,"sourceCodeEnd":null,"githubUrl":"https://github.com/langchain-ai/langgraph/blob/38031739e551638e373fb553453256c23feeb41f/libs/checkpoint/langgraph/checkpoint/store/memory/__init__.py#L400","documentation":"Error \"Unknown operation type: {type(op)}\" thrown in langchain-ai/langgraph.","triggerScenarios":"Thrown at libs/checkpoint/langgraph/checkpoint/store/memory/__init__.py:400 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"}