diff --git a/app/assets/javascripts/editor.js b/app/assets/javascripts/editor.js
index 25cba6e3..5fad1358 100644
--- a/app/assets/javascripts/editor.js
+++ b/app/assets/javascripts/editor.js
@@ -481,14 +481,8 @@ $(function() {
     });
   };
 
-  var showFrame = function(frame) {
-    active_frame = frame;
-    $('.frame').hide();
-    frame.show();
-  };
-
-  var showMainFile = function() {
-    var frame = $('.frame[data-role="main_file"]');
+  var showFirstFile = function() {
+    var frame = $('.frame[data-role="main_file"]').isPresent() ? $('.frame[data-role="main_file"]') : $('.frame').first();
     var file_id = frame.find('.editor').data('file-id');
     active_file = {
       filename: frame.data('filename'),
@@ -499,6 +493,12 @@ $(function() {
     toggleButtonStates();
   };
 
+  var showFrame = function(frame) {
+    active_frame = frame;
+    $('.frame').hide();
+    frame.show();
+  };
+
   var showOutput = function(event) {
     event.preventDefault();
     showTab(2);
@@ -613,7 +613,7 @@ $(function() {
     initializeFileTree();
     initializeTooltips();
     renderScore();
-    showMainFile();
+    showFirstFile();
     showRequestedTab();
   }