mb_strtolower(): Passing null to parameter #1 ($string) of type string is deprecated

+      if ($path_alias != null) {
+        $path_alias = mb_strtolower($alias_manager->getAliasByPath($path));
+      }

As per Drupal coding standards, it is NULL, not null. Furthermore, instead of comparing the value directly with NULL, it is better to use empty() or is_null().

Gautam_105@ → made their first commit to this issue’s fork.

@apaderno ,
i have fixed this issue and created MR for the same. Please review this MR

@apaderno,
i have udated my MR review my changes.

This module is relying on the API of the path_alias module which says AliasManagerInterface::getAliasByPath() returns string. If you are getting a NULL then I would suggest you find out why and fix that. What you are suggesting is that module A can not rely on the published API of module B but is required to type check every value returned from a method in module B?