Merge pull request #1703 from crtlib/patch-2

framework/yii/base/Component.php

@@ -543,13 +543,10 @@ class Component extends Object
 	public function detachBehaviors()
 	{
 		$this->ensureBehaviors();
-		if ($this->_behaviors !== null) {
 		foreach ($this->_behaviors as $name => $behavior) {
 			$this->detachBehavior($name);
 		}
 	}
-		$this->_behaviors = [];
-	}
 
 	/**
 	 * Makes sure that the behaviors declared in [[behaviors()]] are attached to this component.