diff --git a/libraries/src/Form/Filter/UrlFilter.php b/libraries/src/Form/Filter/UrlFilter.php
index f665afb4d7ad1..363c9d75c690e 100644
--- a/libraries/src/Form/Filter/UrlFilter.php
+++ b/libraries/src/Form/Filter/UrlFilter.php
@@ -58,8 +58,8 @@ public function filter(\SimpleXMLElement $element, $value, $group = null, Regist
 
 		// If there is no protocol and the relative option is not specified,
 		// we assume that it is an external URL and prepend http://.
-		if (($element['type'] === 'url' && !$protocol && !$element['relative'])
-			|| (!$element['type'] === 'url' && !$protocol))
+		if (((string) $element['type'] === 'url' && !$protocol && !$element['relative'])
+			|| (!(string) $element['type'] === 'url' && !$protocol))
 		{
 			$protocol = 'http';
 
diff --git a/libraries/src/Form/Rule/EmailRule.php b/libraries/src/Form/Rule/EmailRule.php
index 3187b83c376c9..c761349b7997b 100644
--- a/libraries/src/Form/Rule/EmailRule.php
+++ b/libraries/src/Form/Rule/EmailRule.php
@@ -107,7 +107,7 @@ public function test(\SimpleXMLElement $element, $value, $group = null, Registry
 		 * This allows different components and contexts to use different lists.
 		 * If value is incomplete, com_users.domains is used as fallback.
 		 */
-		$validDomains = (isset($element['validDomains']) && $element['validDomains'] !== 'false');
+		$validDomains = (string) $element['validDomains'] !== '' && (string) $element['validDomains'] !== 'false';
 
 		if ($validDomains && !$multiple)
 		{