since the update the mod fails to load

Failed to initialize plugin 'GrTeleport v1.0.2' (Exception: Error: Loaded CreateSpawnGrid Object reference not set to an instance of an object) at Oxide.Plugins.GrTeleport.Loaded () [0x0035c] in <09885a1c98a14228b52b4d0e64707061>:0 at Oxide.Plugins.GrTeleport.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000a6] in <09885a1c98a14228b52b4d0e64707061>:0 at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in :0 at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in :0 at Oxide.Plugins.CSharpPlugin.HandleAddedToManager (Oxide.Core.Plugins.PluginManager manager) [0x0006e] in :0

Same problem here

Works fine it load on loaded server

Merged post

To solve it on line ~105-107 change to 

if (TerrainMeta.HeightMap != null)
                {
                    sourcePos.y = Mathf.Max(sourcePos.y, TerrainMeta.HeightMap.GetHeight(sourcePos)) + aboveGoundPosition;
                }​

cheers