diff --git a/launcher/InstanceList.cpp b/launcher/InstanceList.cpp
index 111f8d8a4..2b8f34293 100644
--- a/launcher/InstanceList.cpp
+++ b/launcher/InstanceList.cpp
@@ -290,7 +290,8 @@ void InstanceList::deleteGroup(const GroupId& name)
             qDebug() << "Remove" << instID << "from group" << name;
             removed = true;
             auto idx = getInstIndex(instance.get());
-            emit dataChanged(index(idx), index(idx), { GroupRole });
+            if (idx >= 0)
+                emit dataChanged(index(idx), index(idx), { GroupRole });
         }
     }
     if (removed)
@@ -314,7 +315,8 @@ void InstanceList::renameGroup(const QString& src, const QString& dst)
             qDebug() << "Set" << instID << "group to" << dst;
             modified = true;
             auto idx = getInstIndex(instance.get());
-            emit dataChanged(index(idx), index(idx), { GroupRole });
+            if (idx >= 0)
+                emit dataChanged(index(idx), index(idx), { GroupRole });
         }
     }
     if (modified)