diff --git a/Mage/src/main/java/mage/cards/CardsImpl.java b/Mage/src/main/java/mage/cards/CardsImpl.java
index ed69e8ea2f..6433768b79 100644
--- a/Mage/src/main/java/mage/cards/CardsImpl.java
+++ b/Mage/src/main/java/mage/cards/CardsImpl.java
@@ -52,6 +52,9 @@ public class CardsImpl extends LinkedHashSet<UUID> implements Cards, Serializabl
 
     @Override
     public void add(Card card) {
+        if (card == null) {
+            return;
+        }
         this.add(card.getId());
     }