Google Play Games sign-out error

If I try to sign out of Google Play Games via my app, it gives an error message and force closes. Then it continues to do this whenever I try to sign back in, making the leaderboards inaccessible. The only way to get it working again is to uninstall and reinstall my app.

The error it gives is:
Unexpecteded error:com.google.android.gms.common.api.ApiException: 26504: The user must be signed in to make the API call.

Has this happened to anybody else?

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