diff --git a/src/main/java/codechicken/nei/BookmarkContainerInfo.java b/src/main/java/codechicken/nei/BookmarkContainerInfo.java
index 7b7a82ef..6b35703b 100644
--- a/src/main/java/codechicken/nei/BookmarkContainerInfo.java
+++ b/src/main/java/codechicken/nei/BookmarkContainerInfo.java
@@ -22,7 +22,10 @@ public class BookmarkContainerInfo {
     }
 
     public static IBookmarkContainerHandler getBookmarkContainerHandler(GuiContainer gui) {
-        return handlerMap.get(gui.getClass());
+        if (gui != null) {
+            return handlerMap.get(gui.getClass());
+        }
+        return null;
     }
 
     public static void load() {