diff --git a/js/classes.js b/js/classes.js
index 2cf06a0..5cbf2fd 100644
--- a/js/classes.js
+++ b/js/classes.js
@@ -20,7 +20,7 @@ TextArea.prototype.init = function() {
     });
     e.dblclick(function(e) {
         var tc = that.isTc();
-        if (tc) {
+        if (Ox.isNumber(tc)) {
             Video.set(tc);
         }
     });