diff --git a/forge-gui/src/main/java/forge/player/HumanPlaySpellAbility.java b/forge-gui/src/main/java/forge/player/HumanPlaySpellAbility.java
index 54e4e063ca3..deab181cc3b 100644
--- a/forge-gui/src/main/java/forge/player/HumanPlaySpellAbility.java
+++ b/forge-gui/src/main/java/forge/player/HumanPlaySpellAbility.java
@@ -262,7 +262,7 @@ public class HumanPlaySpellAbility {
                     ability.setXManaCostPaid(value);
                 }
             } else {
-                ability.setXManaCostPaid(0);
+                ability.setXManaCostPaid(null);
             }
         }
         return true;