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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/xsitemap/include/functions.php (122)
/modules/xsitemap/include/functions.php (89)
/modules/xsitemap/index.php (36)