diff --git a/src/workspace.coffee b/src/workspace.coffee
index 7e67de97d..c8be01fef 100644
--- a/src/workspace.coffee
+++ b/src/workspace.coffee
@@ -557,6 +557,8 @@ class Workspace extends Model
       editor
 
   handleGrammarUsed: (grammar) ->
+    return unless grammar?
+
     @packageManager.triggerActivationHook("#{grammar.packageName}:grammar-used")
 
   # Public: Returns a {Boolean} that is `true` if `object` is a `TextEditor`.