Index: branches/unlabeled/unlabeled-1.12.10/core/kernel/utility/factory.php
===================================================================
diff -u -N -r4356 -r4375
--- branches/unlabeled/unlabeled-1.12.10/core/kernel/utility/factory.php	(.../factory.php)	(revision 4356)
+++ branches/unlabeled/unlabeled-1.12.10/core/kernel/utility/factory.php	(.../factory.php)	(revision 4375)
@@ -238,12 +238,14 @@
 		 */
 		function registerDependency($depended_class, $class_name)
 		{
+			$dependencies =& $this->Dependencies[$depended_class];
+			
 			$conditions = Array();
-			$conditions['exists'] = in_array($this->realClasses[$class_name], $this->Dependencies[$depended_class]);
+			$conditions['exists'] = is_array($dependencies) && in_array($this->realClasses[$class_name], $dependencies);
 			$conditions['same_class'] = $this->realClasses[$class_name] == $depended_class;
 			
 			if (!$conditions['exists'] && !$conditions['same_class']) {
-				$this->Dependencies[$depended_class][] = $this->realClasses[$class_name];
+				$dependencies[] = $this->realClasses[$class_name];
 			}
 		}
 	}