Use WP_DEBUG before update your plugin
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The plugin creates several errors.
Please use WordPress prepare https://codex.wordpress.org/Class_Reference/wpdb#Protect_Queries_Against_SQL_Injection_Attacks und WP_Error functions https://codex.wordpress.org/Class_Reference/WP_Error
Always check your plugin with https://codex.wordpress.org/WP_DEBUG
Error lines:
Warning: mysql_real_escape_string() expects parameter 2 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/core/model.php on line 542Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
Warning: mysql_error() expects parameter 1 to be resource, object given in /www/htdocs/wp-content/plugins/wysija-newsletters/helpers/install.php on line 485
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