Cannot retrieve user options from database (#1)

Installed WP Edition
When I test firewall I get the error message
Cannot retrieve user options from database (#1)
Troubleshooter says :
NinjaFirewall detection : NinjaFirewall is loaded but returned error code #11
DB Check says
Attempting to connect to the DB: OK
Attempting to read NinjaFirewall’s options (nfw_options) from the DB: OK
Calling fetch_object: OK

Any help is appreciated. Thanks.

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