"Testing attestation" operation hangs in DBQueue


Faced following issue today: "Testing attestation" is still standing in DBQueue after attestation cases calculation. Got following error:

50000    0    re-throw in Procedure viAttestationCheck, Line 1318115    0    detected in (SRV=ABCD01DB60\DBMIT60, DB=Dell1IM) Procedure viAttestationCheck, Line 798115    0    Arithmetic overflow error converting expression to data type int.

Does anybody know how to debug such case or which may led to this error?