initialising change stream results in: TypeError: Cannot read property 'documents' of null

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    • Type: Bug
    • Resolution: Fixed
    • Priority: Major - P3
    • 3.5.10
    • Affects Version/s: 3.5.7
    • Component/s: None
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      This happened when initialising a change stream using a resume token (via `startAfter` option).

      full stack trace:

      TypeError: Cannot read property 'documents' of null
 at /app/node_modules/mongodb/lib/change_stream.js:307:31
 at handleCallback (/app/node_modules/mongodb/lib/core/cursor.js:32:5)
 at /app/node_modules/mongodb/lib/core/cursor.js:685:38
 at /app/node_modules/mongodb/lib/core/cursor.js:694:39
 at ChangeStreamCursor._endSession (/app/node_modules/mongodb/lib/core/cursor.js:395:7)
 at _setCursorNotifiedImpl (/app/node_modules/mongodb/lib/core/cursor.js:694:10)
 at setCursorNotified (/app/node_modules/mongodb/lib/core/cursor.js:685:3)
 at done (/app/node_modules/mongodb/lib/core/cursor.js:451:16)
 at queryCallback (/app/node_modules/mongodb/lib/core/cursor.js:500:18)
 at /app/node_modules/mongodb/lib/core/cursor.js:550:9
 at executeCallback (/app/node_modules/mongodb/lib/operations/execute_operation.js:70:5)
 at callbackWithRetry (/app/node_modules/mongodb/lib/operations/execute_operation.js:118:14)
 at /app/node_modules/mongodb/lib/operations/command_v2.js:90:9
 at /app/node_modules/mongodb/lib/cmap/connection_pool.js:352:13
 at handleOperationResult (/app/node_modules/mongodb/lib/core/sdam/server.js:489:5)
 at MessageStream.messageHandler (/app/node_modules/mongodb/lib/cmap/connection.js:270:5)
 at MessageStream.emit (events.js:209:13)
 at processIncomingData (/app/node_modules/mongodb/lib/cmap/message_stream.js:144:12)
 at MessageStream._write (/app/node_modules/mongodb/lib/cmap/message_stream.js:42:5)
 at doWrite (_stream_writable.js:428:12)
 at writeOrBuffer (_stream_writable.js:412:5)
 at MessageStream.Writable.write (_stream_writable.js:302:11)
 at TLSSocket.ondata (_stream_readable.js:722:22)
 at TLSSocket.emit (events.js:209:13)
 at addChunk (_stream_readable.js:305:12)
 at readableAddChunk (_stream_readable.js:286:11)
 at TLSSocket.Readable.push (_stream_readable.js:220:10)
 at TLSWrap.onStreamRead (internal/stream_base_commons.js:182:23)

      I tried to debug it by placing console.log in various places and comparing it to a case in which the change stream initialised without issues. In the case which lead to the above error the cursor returned by initial aggregation (logged here) operation didn't have postBatchResumeToken property and had id = Long(0):
       

      {
  firstBatch: [],
  id: Long { _bsontype: 'Long', low_: 0, high_: 0 },
  ns: 'my-db.my-collection'
}

      using:
      mongodb@35.7
      node@12.14.0

              Assignee:
              Eric Adum (Inactive)
              Reporter:
              Adrian Gierakowski
              None
              Votes:
              1 Vote for this issue
              Watchers:
              3 Start watching this issue

                Created:
                Updated:
                Resolved: