Problem to create or delete any sticky item

When you have multiple wordpress installations in subdirectories, the plugin gives an error 404 when saving or deleting.
Structure example:
? Domain.com/wordpress-1/
? Domain.com/wordpress-2/

I have been able to fix this problem by editing the following file:
\wp-content\plugins\toast-stick-anything\backend\script.js

Modifying the following text on lines 31 and 63:
'/wp-admin/admin-ajax.php'
by

'./admin-ajax.php'

After doing this, the plugin saves and deletes successfully.
I leave this information here, in case it is helpful.