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-rw-r--r--ui/jquery.effects.core.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/ui/jquery.effects.core.js b/ui/jquery.effects.core.js
index 699b41d81..3dc0a4e67 100644
--- a/ui/jquery.effects.core.js
+++ b/ui/jquery.effects.core.js
@@ -223,7 +223,7 @@ $.effects.animateClass = function( value, duration, easing, callback ) {
return this.queue( function() {
var animated = $( this ),
- baseClass = animated.attr( "class" ),
+ baseClass = animated.attr( "class" ) || "",
finalClass,
allAnimations = o.children ? animated.find( "*" ).andSelf() : animated;