Warning: Illegal string offset 'view_subs' in /usr/home/web/users/a0028402/html/wordpress/wp-content/plugins/ninja-forms/includes/register.php on line 141

Fatal error: Uncaught Error: Cannot use string offset as an array in /usr/home/web/users/a0028402/html/wordpress/wp-content/plugins/ninja-forms/includes/register.php:141 Stack trace: #0 /usr/home/web/users/a0028402/html/wordpress/wp-content/plugins/ninja-forms/includes/admin/pages/ninja-forms-subs/tabs/view-subs/sidebars/select-subs.php(106): ninja_forms_register_sidebar_option('view_subs', Array) #1 /usr/home/web/users/a0028402/html/wordpress/wp-includes/class-wp-hook.php(298): ninja_forms_register_select_sub_submit('') #2 /usr/home/web/users/a0028402/html/wordpress/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #3 /usr/home/web/users/a0028402/html/wordpress/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #4 /usr/home/web/users/a0028402/html/wordpress/wp-settings.php(449): do_action('init') #5 /usr/home/web/users/a0028402/html/wordpress/wp-config.php(90): require_once('/usr/home/web/u...') #6 /usr/home/web/users/a0028402/html/wordpress/wp-load.php(37): require_once('/usr/home/web/u...') #7 in /usr/home/web/users/a0028402/html/wordpress/wp-content/plugins/ninja-forms/includes/register.php on line 141