diff --git a/settings/Controller/SecuritySettingsController.php b/settings/Controller/SecuritySettingsController.php

index 88b2803..5c6f174 100644

--- a/settings/Controller/SecuritySettingsController.php

+++ b/settings/Controller/SecuritySettingsController.php

@@ -60,7 +60,7 @@ protected function returnSuccess() {

 	 * @return array

 	 */

 	public function trustedDomains($newTrustedDomain) {

-		$trustedDomains = $this->config->getSystemValue('trusted_domains');

+		$trustedDomains = $this->config->getSystemValue('trusted_domains', []);

 		$trustedDomains[] = $newTrustedDomain;

 		$this->config->setSystemValue('trusted_domains', $trustedDomains);