diff --git a/src/Utils/Validators.php b/src/Utils/Validators.php
index 7d1e57779..b9ee50b20 100644
--- a/src/Utils/Validators.php
+++ b/src/Utils/Validators.php
@@ -355,6 +355,6 @@ public static function isType(string $type): bool
 	 */
 	public static function isPhpIdentifier(string $value): bool
 	{
-		return is_string($value) && preg_match('#^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$#D', $value);
+		return preg_match('#^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$#D', $value) === 1;
 	}
 }