diff --git a/js/qvitter.js b/js/qvitter.js
index e1b7d9c..ff0fb86 100644
--- a/js/qvitter.js
+++ b/js/qvitter.js
@@ -3213,6 +3213,10 @@ $('body').on('keyup paste input', 'div.queet-box-syntax', function() {
 	currentVal = currentVal.replace(/<br>$/, '').replace(/&nbsp;$/, '').replace(/ $/, ''); // fix
 	$(this).siblings('.syntax-two').html(currentVal);
 
+  // If user click post area before load finished (top gnu logo), this is undefined.
+  if (!window.syntaxHighlightingRegexps) {
+    window.syntaxHighlightingRegexps = Object();
+  }
 
 	// loop through the regexps and highlight
 	$.each(window.syntaxHighlightingRegexps,function(k,v){