diff --git a/jasmine/jasmine.headless-reporter.coffee b/jasmine/jasmine.headless-reporter.coffee
index 8b6d383..75ea16b 100644
--- a/jasmine/jasmine.headless-reporter.coffee
+++ b/jasmine/jasmine.headless-reporter.coffee
@@ -25,7 +25,7 @@ jasmine.Spec.prototype.getJHWSpecInformation = ->
   parts.join("||")
 
 jasmine.Spec.prototype.fail = (e) ->
-  if e and window.CoffeeScriptToFilename
+  if e and e.sourceURL and window.CoffeeScriptToFilename
     filename = e.sourceURL.split('/').pop()
     if realFilename = window.CoffeeScriptToFilename[filename]
       e = {
diff --git a/jasmine/jasmine.headless-reporter.js b/jasmine/jasmine.headless-reporter.js
index c77f219..ab9dee7 100644
--- a/jasmine/jasmine.headless-reporter.js
+++ b/jasmine/jasmine.headless-reporter.js
@@ -28,7 +28,7 @@
   };
   jasmine.Spec.prototype.fail = function(e) {
     var expectationResult, filename, realFilename;
-    if (e && window.CoffeeScriptToFilename) {
+    if (e && e.sourceURL && window.CoffeeScriptToFilename) {
       filename = e.sourceURL.split('/').pop();
       if (realFilename = window.CoffeeScriptToFilename[filename]) {
         e = {