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Error : TypeError: mysqli_fetch_assoc(): Argument #1 ($result) must be of type mysqli_result, bool given

Backtrace:
/class/database/mysqldatabase.php (120)
/modules/APLib/class/APMysqlTree.php (194)
/modules/APCategories/blocks/catMenu.php (18)
/kernel/block.php (500)
/class/theme_blocks.php (202)
/class/theme_blocks.php (131)
/class/theme_blocks.php (49)
/class/theme.php (389)
/class/theme.php (93)
/header.php (53)
/include/common.php (353)
/mainfile.php (87)
/modules/profile/header.php (21)
/modules/profile/userinfo.php (22)