empty backup

[donster22]

Expected behavior and actual behavior.

backing up the database. am expecting the .bak file to contain data. it doesn't.

Steps to reproduce the problem.

backing up via the settings menu.

What version of opencats are you running?

0.9.6 on Ubuntu 18.04.5 LTS

Release or downloaded from Git?

downloaded

WAMP or LAMP?

LAMP (i think)

What version of PHP and MySQL are you running

PHP 5.6.40-51+ubuntu18.04.1+deb.sury.org+1 (cli)
mysql Ver 15.1 Distrib 10.1.48-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

attach appropriate error logs. Please attach [apache/mysql] error/access logs as needed.

this looks relevant from the apache2 error logs but I have no idea what it means.

[Thu Jul 01 10:51:04.005303 2021] [:error] [pid 10446] [client xx.xx.xx.xx:53797] PHP Warning:  mysqli_query() expects 
parameter 1 to be mysqli, object given in
/var/www/html/opencats/modules/settings/ajax/backup.php on line 241, referer: https://xx.xx.xx.xx/opencats/index.php? 
m=settings&a=createBackup

Line 241:
$queryResult = mysqli_query($db, $sql);

[RussH]

Dup of #542