diff --git a/forge-gui/src/main/java/forge/ai/ComputerUtilMana.java b/forge-gui/src/main/java/forge/ai/ComputerUtilMana.java
index 1b6dbf1283b..47e3a3a2436 100644
--- a/forge-gui/src/main/java/forge/ai/ComputerUtilMana.java
+++ b/forge-gui/src/main/java/forge/ai/ComputerUtilMana.java
@@ -97,8 +97,9 @@ public class ComputerUtilMana {
 
     private static boolean payManaCost(final ManaCostBeingPaid cost, final SpellAbility sa, final Player ai, final boolean test, final int extraMana, boolean checkPlayable) {
         final Card card = sa.getSourceCard();
-
-        adjustManaCostToAvoidNegEffects(cost, card);
+        if (card != null) {
+            adjustManaCostToAvoidNegEffects(cost, card);
+        }
 
         final ManaPool manapool = ai.getManaPool();
         List<ManaCostShard> unpaidShards = cost.getUnpaidShards();