Crowd 9 API error

[ericagreene]

When I use the Project Gold interface in CrowdFlower, I intermittently see API errors like this:

Error: Cannot add answer: { Error: Row [1k-demo-ptoxic,erica-demo-requests,004ba3a74c7c5a1147aab625f0f705d4955df2d229d39c123332fe4893c44072,0.3824493160515674,<null>] in table Answers. at /app/node_modules/grpc/src/node/src/client.js:554:15 code: 6, metadata: Metadata { _internal_repr: {} } }

https://console.developers.google.com/logs/viewer?project=wikidetox&organizationId=433637338589&minLogLevel=0&expandAll=false&timestamp=2018-02-21T17%3A06%3A40.000000000Z&interval=PT1H&resource=gae_app%2Fmodule_id%2Fcrowdsource-api&filters=text%3Aerror&logName=projects%2Fwikidetox%2Flogs%2Fappengine.googleapis.com%252Fstdout&logName=projects%2Fwikidetox%2Flogs%2Fappengine.googleapis.com%252Fstderr&logName=projects%2Fwikidetox%2Flogs%2Fappengine.googleapis.com%252Fnginx.request&advancedFilter=resource.type%3D%22gae_app%22%0Aresource.labels.module_id%3D%22crowdsource-api%22%0Aresource.labels.project_id%3D%22wikidetox%22%0Aresource.labels.version_id%3D%2220180206t222156%22%0Atimestamp%3D%222018-02-21T16%3A57%3A24.000000000Z%22%0AinsertId%3D%221invqdifzvv18d%22