diff --git a/libraries/cms/installer/adapter/module.php b/libraries/cms/installer/adapter/module.php
index 2e9e715ebdfc7..e4fc3db00c8d4 100644
--- a/libraries/cms/installer/adapter/module.php
+++ b/libraries/cms/installer/adapter/module.php
@@ -374,6 +374,7 @@ protected function storeExtension()
 
 			// Custom data
 			$this->extension->custom_data    = '';
+			$this->extension->system_data    = '';
 			$this->extension->manifest_cache = $this->parent->generateManifestCache();
 
 			if (!$this->extension->store())