diff --git a/lib/main.coffee b/lib/main.coffee
index 1b3472b2..899d947d 100644
--- a/lib/main.coffee
+++ b/lib/main.coffee
@@ -222,6 +222,7 @@ class Main
   #
   # Returns a {Minimap}.
   minimapForEditor: (textEditor) ->
+    return unless textEditor?
     @editorsMinimaps ?= new Map
 
     minimap = @editorsMinimaps.get(textEditor)