diff --git a/internal_packages/category-picker/lib/category-picker.cjsx b/internal_packages/category-picker/lib/category-picker.cjsx
index 5778fef76..81fccfd20 100644
--- a/internal_packages/category-picker/lib/category-picker.cjsx
+++ b/internal_packages/category-picker/lib/category-picker.cjsx
@@ -265,6 +265,7 @@ class CategoryPicker extends React.Component
 
   _allInInbox: (usageCount, numThreads) ->
     inbox = CategoryStore.getStandardCategory("inbox")
+    return false unless inbox
     return usageCount[inbox.id] is numThreads
 
   _itemForCategory: ({usageCount, numThreads}, category) ->