I've seen a few of these errors in logs for mw1338:
[a36fc37bfd00ccd2ba161307] /rpc/RunSingleJob.php PHP Fatal Error: unexpected N4HPHP13DataBlockFullE: Attempted to emit 1 byte(s) into a 0 byte DataBlock with 0 bytes available. This almost certainly means the TC is full. If this is the case, increasing Eval.JitASize, Eval.JitAColdSize, Eval.JitAFrozenSize and Eval.JitGlobalDataSize in the configuration file when running this script or application should fix this problem.