foolscap Violation: None is not a bytestring
On a ZKAPAuthorizer-enabled Tahoe-LAFS client node sometimes this is logged:
2022-02-01T10:58:12-0500 [-] Fuzzy timer service (lease maintenance service)
Traceback (most recent call last):
File "/nix/store/agy6yqqybdwh6scvmavkrsr1kx4dfrmm-python3-3.9.6-env/lib/python3.9/site-packages/twisted/internet/defer.py", line 501, in errback
self._startRunCallbacks(fail)
File "/nix/store/agy6yqqybdwh6scvmavkrsr1kx4dfrmm-python3-3.9.6-env/lib/python3.9/site-packages/twisted/internet/defer.py", line 568, in _startRunCallbacks
self._runCallbacks()
File "/nix/store/agy6yqqybdwh6scvmavkrsr1kx4dfrmm-python3-3.9.6-env/lib/python3.9/site-packages/twisted/internet/defer.py", line 654, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "/nix/store/agy6yqqybdwh6scvmavkrsr1kx4dfrmm-python3-3.9.6-env/lib/python3.9/site-packages/twisted/internet/defer.py", line 1475, in gotResult
_inlineCallbacks(r, g, status)
--- <exception caught here> ---
File "/nix/store/agy6yqqybdwh6scvmavkrsr1kx4dfrmm-python3-3.9.6-env/lib/python3.9/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
result = g.send(result)
File "/nix/store/agy6yqqybdwh6scvmavkrsr1kx4dfrmm-python3-3.9.6-env/lib/python3.9/site-packages/_zkapauthorizer/controller.py", line 1030, in bracket
result = yield between()
foolscap.tokens.Violation: Violation (RIPrivacyPassAuthorizedStorageServer.tahoe.privatestorage.io.stat_shares(storage_indexes_or_slots=)): ("'None' is not a bytestring",)