fixed crash get bonus

Projekte/mdga/client/src/main/java/pp/mdga/client/board/BoardHandler.java

@@ -541,7 +541,6 @@ public void shieldPiece(UUID uuid){
      * @param uuid the UUID of the piece to unshield
      */
     public void unshieldPiece(UUID uuid){
-
         pieces.get(uuid).deactivateShield();
     }
 

Projekte/mdga/client/src/main/java/pp/mdga/client/board/PieceControl.java

@@ -150,6 +150,9 @@ public void rotateInit() {
      * This adds a visual shield effect in the form of a rotating ring.
      */
     public void activateShield(){
+        if(shieldRing != null){
+            deactivateShield();
+        }
         shieldRing = assetManager.loadModel(Asset.shieldRing.getModelPath());
         shieldRing.scale(1f);
         shieldRing.rotate((float) Math.toRadians(0), 0, (float) Math.toRadians(0));