Warning: Illegal string offset 'view_subs' in /homepages/37/d398423314/htdocs/spellorguk/wp-content/plugins/ninja-forms/includes/register.php on line 148

Fatal error: Uncaught Error: Cannot use string offset as an array in /homepages/37/d398423314/htdocs/spellorguk/wp-content/plugins/ninja-forms/includes/register.php:148 Stack trace: #0 /homepages/37/d398423314/htdocs/spellorguk/wp-content/plugins/ninja-forms/includes/admin/pages/ninja-forms-subs/tabs/view-subs/sidebars/select-subs.php(115): ninja_forms_register_sidebar_option('view_subs', Array) #1 /homepages/37/d398423314/htdocs/spellorguk/wp-includes/plugin.php(496): ninja_forms_register_select_sub_submit('') #2 /homepages/37/d398423314/htdocs/spellorguk/wp-settings.php(353): do_action('init') #3 /homepages/37/d398423314/htdocs/spellorguk/wp-config.php(90): require_once('/homepages/37/d...') #4 /homepages/37/d398423314/htdocs/spellorguk/wp-load.php(29): require_once('/homepages/37/d...') #5 /homepages/37/d398423314/htdocs/spellorguk/wp-blog-header.php(12): require_once('/homepages/37/d...') #6 /homepages/37/d398423314/htdocs/spellorguk/index.php(17): require('/homepages/37/d...') #7 {main} thrown in /homepages/37/d398423314/htdocs/spellorguk/wp-content/plugins/ninja-forms/includes/register.php on line 148