Merge branch 'master' of https://github.com/Anuken/Mindustry into new-pathfinding

core/src/mindustry/ai/types/CommandAI.java

@@ -399,6 +399,8 @@ public class CommandAI extends AIController{
 
     @Override
     public void commandPosition(Vec2 pos){
+        if(pos == null) return;
+
         commandPosition(pos, false);
         if(commandController != null){
             commandController.commandPosition(pos);
@@ -406,8 +408,10 @@ public class CommandAI extends AIController{
     }
 
     public void commandPosition(Vec2 pos, boolean stopWhenInRange){
-        targetPos = pos;
-        lastTargetPos = pos;
+        if(pos == null) return;
+
+        //this is an allocation, but it's relatively rarely called anyway, and outside mutations must be prevented
+        targetPos = lastTargetPos = pos.cpy();
         attackTarget = null;
         pathId = Vars.controlPath.nextTargetId();
         this.stopWhenInRange = stopWhenInRange;