PHP Warning: mysqli_real_escape_string() expects parameter 2 to be string

Hi,

I am seeing several PHP warnings in my error logs for this plugin. Here is a stack trace:

E_WARNING: mysqli_real_escape_string() expects parameter 2 to be string, array given
in mysqli_real_escape_string called at /var/www/vhosts/site.test/httpdocs/wp-includes/wp-db.php (1102)
in wpdb::_real_escape called at /var/www/vhosts/site.test/httpdocs/wp-includes/wp-db.php (1186)
in wpdb::escape_by_ref called at ? (?)
in array_walk called at /var/www/vhosts/site.test/httpdocs/wp-includes/wp-db.php (1302)
in wpdb::prepare called at /var/www/vhosts/site.test/httpdocs/wp-includes/wp-db.php (2093)
in wpdb::_insert_replace_helper called at /var/www/vhosts/site.test/httpdocs/wp-includes/wp-db.php (2015)
in wpdb::insert called at /var/www/vhosts/site.test/httpdocs/wp-content/plugins/stream/classes/class-db-driver-wpdb.php (96)
in WP_Stream\DB_Driver_WPDB::insert_meta called at /var/www/vhosts/site.test/httpdocs/wp-content/plugins/stream/classes/class-db-driver-wpdb.php (72)
in WP_Stream\DB_Driver_WPDB::insert_record called at /var/www/vhosts/site.test/httpdocs/wp-content/plugins/stream/classes/class-db.php (62)
in WP_Stream\DB::insert called at /var/www/vhosts/site.test/httpdocs/wp-content/plugins/stream/classes/class-log.php (129)
in WP_Stream\Log::log called at ? (?)
in call_user_func_array called at /var/www/vhosts/site.test/httpdocs/wp-content/plugins/stream/classes/class-connector.php (129)
in WP_Stream\Connector::log called at /var/www/vhosts/site.test/httpdocs/wp-content/plugins/stream/connectors/class-connector-widgets.php (606)
in WP_Stream\Connector_Widgets::callback_updated_option called at ? (?)
in call_user_func_array called at /var/www/vhosts/site.test/httpdocs/wp-content/plugins/stream/classes/class-connector.php (78)
in WP_Stream\Connector::callback called at /var/www/vhosts/site.test/httpdocs/wp-includes/class-wp-hook.php (286)
in WP_Hook::apply_filters called at /var/www/vhosts/site.test/httpdocs/wp-includes/class-wp-hook.php (310)
in WP_Hook::do_action called at /var/www/vhosts/site.test/httpdocs/wp-includes/plugin.php (453)
in do_action called at /var/www/vhosts/site.test/httpdocs/wp-includes/option.php (412)
in update_option called at /var/www/vhosts/site.test/httpdocs/wp-includes/class-wp-widget.php (553)