diff --git a/lib/installer.php b/lib/installer.php
index e082c7eeee..89358e7827 100644
--- a/lib/installer.php
+++ b/lib/installer.php
@@ -396,6 +396,9 @@ class OC_Installer{
 			include OC_App::getAppPath($app)."/appinfo/install.php";
 		}
 		$info=OC_App::getAppInfo($app);
+		if (is_null($info)) {
+			return;
+		}
 		OC_Appconfig::setValue($app, 'installed_version', OC_App::getAppVersion($app));
 
 		//set remote/public handelers