Check if second argument is a function in signals.connect before connecting to the signal

1 files changed, 3 insertions, 3 deletions

diff --git a/scripts/lib/signals.js b/scripts/lib/signals.js
index cec5e54a..9561d13d 100644
--- a/scripts/lib/signals.js
+++ b/scripts/lib/signals.js
@@ -29,14 +29,14 @@
       value : (function () {
         var id = 0;
         return function(sig, func) {
+          if (func === null || typeof func !== "function") {
+            return -1;
+          }
           ++id;
           if (_registered[sig] === undefined || _registered[sig] === null) {
             _registered[sig] = [];
             signals[sig] = function () { return signals.emit(sig, arguments); };
           }
-          if (func === null || typeof func !== "function") {
-            return -1;
-          }
           _registered[sig].push({callback : func, id : id, connected : true });
           return id;
         };