Fatal error: Uncaught Error: Call to a member function prop() on null in /home/xs489385/sk-superwall.jp/public_html/wp-content/plugins/contact-form-7-multi-step-module/cf7msm.php:654
Stack trace:
#0 /home/xs489385/sk-superwall.jp/public_html/wp-content/plugins/contact-form-7-multi-step-module/cf7msm.php(726): parse_form_for_multistep(NULL)
#1 /home/xs489385/sk-superwall.jp/public_html/wp-includes/class-wp-hook.php(324): cf7msm_setup_next_url('/muryoukaihou/#...')
#2 /home/xs489385/sk-superwall.jp/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('/muryoukaihou/#...', Array)
#3 /home/xs489385/sk-superwall.jp/public_html/wp-content/plugins/contact-form-7/includes/contact-form.php(564): apply_filters('wpcf7_form_acti...', '/muryoukaihou/#...')
#4 /home/xs489385/sk-superwall.jp/public_html/wp-content/plugins/contact-form-7/includes/contact-form-functions.php(235): WPCF7_ContactForm->form_html(Array)
#5 [internal function]: {closure}(Object(WPCF7_ContactForm), Array)
#6 /home/xs489385/sk-superwall.jp/public_html/ in /home/xs489385/sk-superwall.jp/public_html/wp-content/plugins/contact-form-7-multi-step-module/cf7msm.php on line 654