NullReferenceException: Object reference not set to an instance of an object at PQS.Mod_OnVertexBuild Causes a CTD

[Joey-Destroyah]

In the KSP.log file, I noticed this

"NullReferenceException: Object reference not set to an instance of an object
PQS.Mod_OnVertexBuild (PQS+VertexBuildData data) (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQS.BuildQuad (PQ quad) (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.Build () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.SetVisible () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateVisibility () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateSubdivision () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateSubdivision () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateSubdivision () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateSubdivision () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateSubdivision () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateSubdivision () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateSubdivision () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQ.UpdateSubdivision () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQS.UpdateQuadsInit () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQS.StartSphere (System.Boolean force) (at <4b449f2841f84227adfaad3149c8fdba>:0)
PQS.StartUpSphere () (at <4b449f2841f84227adfaad3149c8fdba>:0)
PhysicsRangeExtender.TerrainExtender.UpdateSphere () (at <8d8b045516a343de9b8cff73538406ea>:0)
PhysicsRangeExtender.PhysicsRangeExtender.Start () (at <8d8b045516a343de9b8cff73538406ea>:0)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
ModuleManager.UnityLogHandle.InterceptLogHandler:LogException(Exception, Object)
UnityEngine.Debug:CallOverridenDebugHandler(Exception, Object)"