Hello, @todor_nikov . I am assuming the error message you get is:
"message": "PleskX\\Api\\Operator\\Database::getAll(): Argument #1 ($field) must be of type string, null given, called in \/usr\/local\/psa\/admin\/plib\/modules\/rest-api\/v2\/library\/SDK\/pm_Database.php on line 47"
If that's the case, the behavior is recognized as a bug identified with ID PPPM-14904. More details and a possible workaround you can find in this thread. If not, please provide the exact message you are encountering and if there are any specific steps we should be performing to reproduce the issue. Thank you in advance.