CoRE Errors In Logs

I’m seeing the following errors every 10 or 15 seconds. Is this a known issue?

9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:49:42 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:49:32 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:49:21 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:49:11 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:49:00 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:48:50 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:48:39 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:48:29 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:48:18 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343
9b1e2a37-43ce-4d11-a1bb-859339a65fef 1:48:08 PM: error java.lang.NullPointerException: Cannot get property ‘children’ on null object @ line 9343