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diff --git a/includes/StubObject.php b/includes/StubObject.php
index 59238faa90..a3970f34cb 100644
--- a/includes/StubObject.php
+++ b/includes/StubObject.php
@@ -25,6 +25,12 @@
  * their associated module code by deferring initialisation until the first
  * method call.
  *
+ * Note on reference parameters:
+ *
+ * If the called method takes any parameters by reference, the __call magic
+ * here won't work correctly. The solution is to unstub the object before
+ * calling the method.
+ *
  * Note on unstub loops:
  *
  * Unstub loops (infinite recursion) sometimes occur when a constructor calls
@@ -63,6 +69,20 @@ class StubObject {
 		return is_object( $obj ) && !$obj instanceof StubObject;
 	}
 
+	/**
+	 * Unstubs an object, if it is a stub object. Can be used to break a
+	 * infinite loop when unstubbing an object or to avoid reference parameter
+	 * breakage.
+	 *
+	 * @param $obj Object to check.
+	 * @return void
+	 */
+	static function unstub( $obj ) {
+		if ( $obj instanceof StubObject ) {
+			$obj->_unstub( 'unstub', 3 );
+		}
+	}
+
 	/**
 	 * Function called if any function exists with that name in this object.
 	 * It is used to unstub the object. Only used internally, PHP will call