This was spammed every 100 frames for 2 hours and 20 minutes on the same grid:
[2015-07-18 03:41:14,420][ERROR][145296933244176754][GridEnforcer][UpdateBeforeSimulation100][][]Exception occured: System.NullReferenceException: Object reference not set to an instance of an object.
at GardenConquest.Core.Core_Server.eventCleanupViolation(GridEnforcer ge, List`1 violations)
at GardenConquest.Blocks.GridEnforcer.notifyViolations()
at GardenConquest.Blocks.GridEnforcer.UpdateBeforeSimulation100()
This was spammed every 100 frames for 2 hours and 20 minutes on the same grid: