diff --git a/tasks/config/tasks.js b/tasks/config/tasks.js
index 3e33556312..eae6e54961 100644
--- a/tasks/config/tasks.js
+++ b/tasks/config/tasks.js
@@ -105,7 +105,7 @@ module.exports = {
             theme,
             element
           ;
-          if(error.filename.match(/theme.less/)) {
+          if(error && error.filename && error.filename.match(/theme.less/)) {
             if (error.line == 9) {
               element = regExp.variable.exec(error.message)[1];
               if (element) {