Fix #61

Author: a-lucas

src/tabs/tabs.js

@@ -201,8 +201,22 @@ angular.module('mm.foundation.tabs', [])
         }
 
         scope.$watch('active', function(active) {
+			/**
+			 * The issue https://github.com/pineconellc/angular-foundation/issues/61 was hard to replicate.
+			 * To replicate it, you need to have a very large page, with lots of data and controllers 
+			 * (I had around 25 controllers who each inherits the same main profile controller )
+			 * On initialization, attrs.active is true
+			 * But the active attributes was a complex expression that takes time to parse because of the large amount of controllers on the page
+			 * The getActive = $parse(attrs.active); expression takes time to parse, but at the same time, the $watch is triggered.
+			 * This means the setActive is undefined in this specific case.
+			 * 
+			 */
+			 if(typeof  setActive !== 'function'){
+				 return;
+			 }
+			
           // Note this watcher also initializes and assigns scope.active to the
-          // attrs.active expression.
+          // attrs.active expression.          
           setActive(scope.$parent, active);
           if (active) {
             tabsetCtrl.select(scope);