{"record":{"id":"392fa4199974891c","repo":"BoundaryML/baml","slug":"object-method-function-returned-nil-pointer","errorCode":null,"errorMessage":"object method function returned nil pointer","messagePattern":"object method function returned nil pointer","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"engine/language_client_go/baml_go/raw_objects/utils.go","lineNumber":182,"sourceCode":"\t\tObject:     EncodeRawObject(object),\n\t\tMethodName: method_name,\n\t}\n\n\tencodedArgs, err := proto.Marshal(&args)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to marshal object method arguments: %w\", err)\n\t}\n\tcEncodedArgs := (*C.char)(unsafe.Pointer(&encodedArgs[0]))\n\n\tcBuf := C.WrapCallObjectMethodFunction(object.Runtime(), cEncodedArgs, C.uintptr_t(len(encodedArgs)))\n\n\tcontent_bytes := C.GoBytes(unsafe.Pointer(cBuf.ptr), C.int32_t(cBuf.len))\n\tC.WrapFreeBuffer(cBuf) // Free the buffer after use\n\tif cBuf.len == 0 {\n\t\treturn nil, fmt.Errorf(\"failed to call object method function\")\n\t}\n\tif cBuf.ptr == nil {\n\t\treturn nil, fmt.Errorf(\"object method function returned nil pointer\")\n\t}\n\n\tvar content_holder cffi.InvocationResponse\n\terr = proto.Unmarshal(content_bytes, &content_holder)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to unmarshal content bytes: %w\", err)\n\t}\n\n\tparsed, err := decodeObjectResponse(object.Runtime(), &content_holder)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to decode object response: %w\", err)\n\t}\n\n\treturn parsed, nil\n}\n\ntype nilObject struct {\n\tany","sourceCodeStart":164,"sourceCodeEnd":200,"githubUrl":"https://github.com/BoundaryML/baml/blob/bd85ce9dee1463ff04d27efd20531013a4ff46c1/engine/language_client_go/baml_go/raw_objects/utils.go#L164-L200","documentation":"This error means the FFI call returned a buffer whose pointer is nil (even though its length was non-zero), i.e. the object method invocation returned no valid response pointer. This is an FFI contract violation indicating a native-side failure to allocate/return a response.","triggerScenarios":"CallMethod (used by destructor, Type, ListProperties, AddProperty, Property, SetType) hitting a native response with nil buffer pointer; typically follows native memory allocation failure or misuse of the C wrapper.","commonSituations":"Out-of-memory in the native runtime; corrupted runtime handle; a bug in the C wrapper for a specific object type.","solutions":["Check FFI logs for the object type and pointer involved","Retry; if consistent, downgrade/upgrade BAML versions together","Reduce payload/argument sizes if near memory limits","Report to BAML maintainers with the FFI log"],"exampleFix":null,"handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":"res, err := CallMethod(obj, m, kwargs)\nif err != nil && strings.Contains(err.Error(), \"returned nil pointer\") {\n    res, err = CallMethod(obj, m, kwargs) // one retry for transient native allocation failure\n}","preventionTips":["Avoid extreme memory pressure when using BAML FFI","Verify object handles are valid (not from a freed runtime)","Report consistent occurrences with FFI logs"],"tags":["go","ffi","native","memory"],"backgroundTag":"internal-invariant-violation","analyzedSha":"bd85ce9dee1463ff04d27efd20531013a4ff46c1","analyzedAt":"2026-09-12T03:38:25.718Z","contentChangedAt":"2026-09-12T03:38:25.718Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}