Merge remote-tracking branch 'upstream/stable' into stable

Author: dearminder

src/pocketmine/entity/behavior/MeleeAttackBehavior.php

@@ -73,6 +73,10 @@ public function canContinue() : bool{
 
 	public function onTick() : void{
 		$target = $this->mob->getTargetEntity();
+		
+		if($target === null){
+			return;
+		}
 
 		$distanceToPlayer = $this->mob->distanceSquared($target);
 
@@ -117,4 +121,4 @@ public function onEnd() : void{
 		$this->mob->getNavigator()->clearPath();
 	}
 
-}
+}