From 057fc34110b0f05b7c2f63799a8f01bd947c0e23 Mon Sep 17 00:00:00 2001
From: Sloth <sloth@cardforge.org>
Date: Sat, 18 Apr 2015 11:07:29 +0000
Subject: [PATCH] - Fixed NPE caused by Sidisi, Brood Tyrant (but it still
 won't work correctly with some effects).

---
 .../src/main/java/forge/game/trigger/TriggerChangesZone.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/forge-game/src/main/java/forge/game/trigger/TriggerChangesZone.java b/forge-game/src/main/java/forge/game/trigger/TriggerChangesZone.java
index c61db5f2b6b..7cad2a61bff 100644
--- a/forge-game/src/main/java/forge/game/trigger/TriggerChangesZone.java
+++ b/forge-game/src/main/java/forge/game/trigger/TriggerChangesZone.java
@@ -138,7 +138,7 @@ public class TriggerChangesZone extends Trigger {
             // card, rather than keeping track of the host card itself - but it's good enough for now - since there are
             // no cards with multiple different OncePerEffect triggers.
             SpellAbilityStackInstance si = (SpellAbilityStackInstance) runParams2.get("SpellAbilityStackInstance");
-            return si.attemptOncePerEffectTrigger(this.getHostCard());
+            return si != null && si.attemptOncePerEffectTrigger(this.getHostCard());
         }
 
         return true;