X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fcore.js;h=1d5a25bd5dab645bc45c410ced0450df1c249a5e;hb=990d9ca1b05a587cce7599a1a40aa2558117db41;hp=611e5363bba0e2530ce70e0726dc33339f505f67;hpb=1ce92e022ddd6f547515e855544ba3c2fb1416e0;p=jquery.git

diff --git a/src/core.js b/src/core.js
index 611e536..1d5a25b 100644
--- a/src/core.js
+++ b/src/core.js
@@ -328,13 +328,20 @@ jQuery.extend({
 			return false;
 		}
 		
+		// not own constructor property must be Object
+		if ( obj.constructor
+		  && !hasOwnProperty.call(obj, "constructor")
+		  && !hasOwnProperty.call(obj.constructor.prototype, "isPrototypeOf") ) {
+			return false;
+		}
+		
 		//own properties are iterated firstly,
 		//so to speed up, we can test last one if it is own or not
-		
+	
 		var key;
 		for ( key in obj ) {}
 		
-		return !key || hasOwnProperty.call( obj, key );
+		return key === undefined || hasOwnProperty.call( obj, key );
 	},
 
 	isEmptyObject: function( obj ) {