Fix suffocation issue at the expense of performance

src/main/java/io/github/cadiboo/nocubes/collision/CollisionHandler.java

@@ -79,7 +79,7 @@ public static VoxelShape getCollisionShapeOrThrow(boolean canCollide, BlockState
 
 		var entity = context.getEntity();
 		if (entity instanceof FallingBlockEntity || // Stop sand etc. breaking when it falls
-			(NoCubesConfig.Server.tempMobCollisionsDisabled && !(entity instanceof Player)) ||
+			(entity != null && NoCubesConfig.Server.tempMobCollisionsDisabled && !(entity instanceof Player)) ||
 			// Stop grass path turning to dirt causing a crash from trying to turn an empty VoxelShape into an AABB
 			(entity == null && reader.getBlockState(blockPos) != state)
 		)