Merge Cards Error

🐛 Bug
1

Before the error happened, I was…
[Replace this text.]

Error message (don't change this) 
Anki 25.09.4 (d52ca669) (ao)
Python 3.13.5 Qt 6.9.1 PyQt 6.9.1
Platform: macOS-26.6.1-arm64-arm-64bit-Mach-O

Traceback (most recent call last):

  File "/Users/nates/Library/Application Support/AnkiProgramFiles/.venv/lib/python3.13/site-packages/aqt/taskman.py", line 148, in _on_closures_pending
    closure()
    ~~~~~~~^^

  File "/Users/nates/Library/Application Support/AnkiProgramFiles/.venv/lib/python3.13/site-packages/aqt/taskman.py", line 88, in <lambda>
    lambda future: self.run_on_main(lambda: on_done(future))
                                            ~~~~~~~^^^^^^^^

  File "/Users/nates/Library/Application Support/Anki2/addons21/1322529746/gui/operations/ankihub_sync.py", line 58, in wrapped_on_done
    status: SyncStatus = fut.result()
                         ~~~~~~~~~~^^

  File "/Users/nates/Library/Application Support/AnkiProgramFiles/python/cpython-3.13.5-macos-aarch64-none/lib/python3.13/concurrent/futures/_base.py", line 449, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^

  File "/Users/nates/Library/Application Support/AnkiProgramFiles/python/cpython-3.13.5-macos-aarch64-none/lib/python3.13/concurrent/futures/_base.py", line 401, in __get_result
    raise self._exception

  File "/Users/nates/Library/Application Support/AnkiProgramFiles/python/cpython-3.13.5-macos-aarch64-none/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)

  File "/Users/nates/Library/Application Support/Anki2/addons21/1322529746/gui/operations/ankihub_sync.py", line 67, in <lambda>
    kwargs: Dict[str, Any] = {"task": lambda: mw.col.sync_status(auth), "on_done": wrapped_on_done}
                                              ~~~~~~~~~~~~~~~~~~^^^^^^

  File "/Users/nates/Library/Application Support/AnkiProgramFiles/.venv/lib/python3.13/site-packages/anki/collection.py", line 1153, in sync_status
    return self._backend.sync_status(auth)
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^

  File "/Users/nates/Library/Application Support/AnkiProgramFiles/.venv/lib/python3.13/site-packages/anki/_backend_generated.py", line 93, in sync_status
    raw_bytes = self._run_command(1, 4, message.SerializeToString())

  File "/Users/nates/Library/Application Support/AnkiProgramFiles/.venv/lib/python3.13/site-packages/anki/_backend.py", line 160, in _run_command
    return self._backend.command(service, method, input)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^

pyo3_runtime.PanicException: called `Result::unwrap()` on an `Err` value: PoisonError { .. }

Sentry link (for developers)

2

Hi,

Can you clarify what you mean by “Merge Cards”? It’s not an add-on feature.

The attached error appears to be unrelated, and usually indicates an earlier fatal error (Anki should show an error dialog with a button labeled “Copy Debug Info” that you can click to copy the full error). But in any case, I recommend following all troubleshooting steps here (especially using Tools → Check Database): Troubleshooting - Anki Manual