diff --git a/src/main/java/eu/siacs/conversations/entities/Conversation.java b/src/main/java/eu/siacs/conversations/entities/Conversation.java
index b26cddc93e45abf1ebed09e927bdbf4b069cd5e7..b26d2c2fe2affdf540ee60f174146d1a4821fcb1 100644
--- a/src/main/java/eu/siacs/conversations/entities/Conversation.java
+++ b/src/main/java/eu/siacs/conversations/entities/Conversation.java
@@ -1309,7 +1309,7 @@ public class Conversation extends AbstractEntity implements Blockable, Comparabl
             if (o == mPager.getChildAt(0)) return PagerAdapter.POSITION_UNCHANGED;
             if (o == mPager.getChildAt(1)) return PagerAdapter.POSITION_UNCHANGED;
 
-            int pos = sessions.indexOf(o);
+            int pos = sessions == null ? -1 : sessions.indexOf(o);
             if (pos < 0) return PagerAdapter.POSITION_NONE;
             return pos + 2;
         }