diff --git a/core/Object.php b/core/Object.php
index 0a28bae0a..21a741511 100644
--- a/core/Object.php
+++ b/core/Object.php
@@ -908,6 +908,10 @@ abstract class SS_Object {
 		$methods = $this->findMethodsFromExtension($extension);
 		if ($methods) {
 			foreach ($methods as $method) {
+				if (!isset(self::$extra_methods[$this->class][$method])) {
+					continue;
+				}
+				
 				$methodInfo = self::$extra_methods[$this->class][$method];
 
 				if ($methodInfo['property'] === $property && $methodInfo['index'] === $index) {