diff --git a/javascripts/theme.js b/javascripts/theme.js
index 50fc8e6..d155b1a 100644
--- a/javascripts/theme.js
+++ b/javascripts/theme.js
@@ -112,8 +112,11 @@ function alter_new_issue_page() {
   });
   $('input#issue_subject').on('change', function(evt) {
     var val = $(this).val();
-    var uppercases = val.match(/[A-Z]/g).length;
-    var all_letters = val.match(/[^\s+]/g).length;
+    if (val.length < 5) {
+      return true;
+    }
+    var uppercases = (val.match(/[A-Z]/g) || "").length;
+    var all_letters = (val.match(/[^\s+]/g) || "").length;
     var ratio = uppercases / all_letters;
     if (ratio > 0.6) {  // more than 60% of uppercase letters
       // change to lower case