Index: branches/RC/kernel/admin_templates/incs/catalog.js
===================================================================
diff -u -r9524 -r9525
--- branches/RC/kernel/admin_templates/incs/catalog.js	(.../catalog.js)	(revision 9524)
+++ branches/RC/kernel/admin_templates/incs/catalog.js	(.../catalog.js)	(revision 9525)
@@ -192,7 +192,10 @@
 		return false;
 	}
 
-	if (!isset($prefix)) $prefix = this.ActivePrefix;
+	if (!isset($prefix) || $prefix == '') {
+		// prefix not given OR empty prefix
+		$prefix = this.ActivePrefix;
+	}
 
 	if (this.BusyRequest[$prefix]) {
 		alert('prefix: ['+$prefix+']; request busy: ['+this.BusyRequest[$prefix]+']');