Still some warnings to fix

I got a lot of those:
PHP Notice: Undefined variable: mysqli in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 154
PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 154
PHP Notice: Undefined variable: val in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 172
PHP Notice: Undefined variable: mysqli in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 173
PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 173
PHP Notice: Undefined variable: mysqli in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 154
PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 154
PHP Notice: Undefined variable: val in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 172
PHP Notice: Undefined variable: mysqli in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 173
PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 173
PHP Notice: Undefined variable: mysqli in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 154
PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 154
PHP Notice: Undefined variable: val in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 172
PHP Notice: Undefined variable: mysqli in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 173
PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 173
PHP Notice: Undefined variable: mysqli in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 154
PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 154
PHP Notice: Undefined variable: val in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 172
PHP Notice: Undefined variable: mysqli in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 173
PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /var/www/mypolacy.de/sendy/includes/helpers/class.amazonses.php on line 173