diff --git a/src/atom-application.coffee b/src/atom-application.coffee
index 96bc30b6d..653e28687 100644
--- a/src/atom-application.coffee
+++ b/src/atom-application.coffee
@@ -255,6 +255,8 @@ class AtomApplication
       if sessionId
         bootstrapScript = 'collaboration/lib/bootstrap'
         new AtomWindow({bootstrapScript, @resourcePath, sessionId})
+    else
+      console.log "Opening unknown url #{urlToOpen}"
 
   openConfig: ->
     if @configWindow