Restart and error message

My iMac keeps restarting . This is the message. I have tried SafeMode once and reset PRAM. any thought on this message?

{"caused_by":"macos","macos_version":"Mac OS X 10.14.4 (18E226)","os_version":"Bridge OS 3.4 (16P4507)","macos_system_state":"running","incident_id":"CC9F2884-03F9-4639-AAE0-F197FEFE498E","timestamp":"2019-04-21 14:30:54.95 +0000","bug_type":"210"}