diff --git a/Mage/src/main/java/mage/game/combat/Combat.java b/Mage/src/main/java/mage/game/combat/Combat.java
index 45b7894b72..d26bc9ec60 100644
--- a/Mage/src/main/java/mage/game/combat/Combat.java
+++ b/Mage/src/main/java/mage/game/combat/Combat.java
@@ -578,6 +578,9 @@ public class Combat implements Serializable, Copyable<Combat> {
      * @param game
      */
     private void retrieveMustBlockAttackerRequirements(Player attackingPlayer, Game game) {
+        if (attackingPlayer == null) {
+            return;
+        }
         if (!game.getContinuousEffects().existRequirementEffects()) {
             return;
         }