Probleme with forget password

Hello i have an error when i reset password and submit on reset form page

php 8.1

error log

[14-Aug-2024 14:21:30 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 655
[14-Aug-2024 14:21:30 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 1069
[14-Aug-2024 14:21:30 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 1541
[14-Aug-2024 14:21:31 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 655
[14-Aug-2024 14:21:31 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 1069
[14-Aug-2024 14:21:31 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 1541
[14-Aug-2024 14:21:32 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 655
[14-Aug-2024 14:21:32 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 1069
[14-Aug-2024 14:21:32 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 1541
[14-Aug-2024 14:21:32 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 655
[14-Aug-2024 14:21:32 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 1069
[14-Aug-2024 14:21:32 UTC] PHP Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/wp-content/plugins/stranoweb-ajax-login/includes/functions/functions-forms.php on line 1541
[14-Aug-2024 14:24:48 UTC] PHP Warning: Undefined variable $output in /home /wp-content/plugins/stranoweb-ajax-login/includes/functions/functions.php on line 781