Pet battle bug

ok Im making a pet battle path and once I have made the path, I start the bot and a little after doing some battles Im getting this error.

[N] 15:32:07 - Path Count: 2

15:32:10 - Mounting fly mount Swift Flight Form

[N] 15:32:11 - Long Move distance: 6197.547

15:32:25 - [PetBattle] Player Attack Festering Maggot (lvl 1)

[N] 15:32:25 - Download map "Azeroth\Azeroth_41_27.tile"

[N] 15:32:26 - Load finish: E:\WOW Stuff\Blizzard\WRobot\Meshes\Azeroth\Azeroth_41_27.tile

[N] 15:32:26 - Failure No polyref found for start

[N] 15:32:26 - InvalidParam, Failure FindPath failed, start: 0 end: 17337576

[E] 15:32:26 - FindPath(Point startVec, Point endVec, out bool resultSuccess): Continent: Selected: Azeroth - InGame: Azeroth - ERROR: System.NullReferenceException: Object reference not set to an instance of an object.

at DetourLayer.NavMeshQuery.FindStraightPath(Single[] start, Single[] end, UInt32[] pathCorridor, Single[]& straightPath, StraightPathFlag[]& straightPathFlags, UInt32[]& straightPathRefs)

at zRGneqQrP5gGXQs1IQ.Ns6V7TP1YxVlnZYbhQ.Unm68wm0nj(Vector3 , Vector3 , Boolean& )

Im not sure what the cause is but its happening alot.