Collection::offsetExists and ErrorException: iconv Fatal Errors

[adamsewell]

I've recently noticed that incoming email is not automatically creating new tickets. When I run System -> Tools -> Fetch Email it works as normal. However, when I run the cron job manually, I get the following fatal errors.

PHP Fatal error:  During inheritance of ArrayAccess: Uncaught ErrorException: Return type of Illuminate\Support\Collection::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /path/to/freescout/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1693
Stack trace:
#0 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Support/Collection.php(19): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
#1 /path/to/freescout/vendor/composer/ClassLoader.php(478): include('...')
#2 /path/to/freescout/vendor/composer/ClassLoader.php(346): Composer\Autoload\includeFile()
#3 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Support/helpers.php(423): Composer\Autoload\ClassLoader->loadClass()
#4 /path/to/freescout/overrides/Illuminate/Foundation/PackageManifest.php(80): collect()
#5 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/RegisterFacades.php(26): Illuminate\Foundation\PackageManifest->aliases()
#6 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(213): Illuminate\Foundation\Bootstrap\RegisterFacades->bootstrap()
#7 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(296): Illuminate\Foundation\Application->bootstrapWith()
#8 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(119): Illuminate\Foundation\Console\Kernel->bootstrap()
#9 /path/to/freescout/artisan(43): Illuminate\Foundation\Console\Kernel->handle()
#10 {main} in /path/to/freescout/vendor/laravel/framework/src/Illuminate/Support/Collection.php on line 19

PHP Fatal error:  Uncaught ErrorException: iconv(): Passing null to parameter #3 ($string) of type string is deprecated in /path/to/freescout/vendor/symfony/polyfill-mbstring/Mbstring.php:114
Stack trace:
#0 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
#1 /path/to/freescout/vendor/symfony/polyfill-mbstring/Mbstring.php(114): iconv()
#2 /path/to/freescout/vendor/symfony/polyfill-mbstring/Mbstring.php(123): Symfony\Polyfill\Mbstring\Mbstring::mb_convert_encoding()
#3 [internal function]: Symfony\Polyfill\Mbstring\Mbstring::Symfony\Polyfill\Mbstring\{closure}()
#4 /path/to/freescout/vendor/symfony/polyfill-mbstring/Mbstring.php(126): array_walk_recursive()
#5 /path/to/freescout/vendor/symfony/polyfill-mbstring/bootstrap.php(52): Symfony\Polyfill\Mbstring\Mbstring::mb_convert_variables()
#6 /path/to/freescout/vendor/symfony/console/Application.php(1236): mb_convert_variables()
#7 /path/to/freescout/vendor/symfony/console/Application.php(794): Symfony\Component\Console\Application->splitStringByWidth()
#8 /path/to/freescout/vendor/symfony/console/Application.php(768): Symfony\Component\Console\Application->doRenderException()
#9 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(480): Symfony\Component\Console\Application->renderException()
#10 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(101): Illuminate\Foundation\Exceptions\Handler->renderForConsole()
#11 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(87): Illuminate\Foundation\Bootstrap\HandleExceptions->renderForConsole()
#12 /path/to/freescout/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(123): Illuminate\Foundation\Bootstrap\HandleExceptions->handleException()
#13 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleShutdown()
#14 {main}
  thrown in /path/to/freescout/vendor/symfony/polyfill-mbstring/Mbstring.php on line 114

PHP Version: PHP 7.4.27
Web Server: nginx/1.21.4

[freescout-helpdesk]

Check your console PHP version. It may be different.

[adamsewell]

It is different, it appears it's trying to use PHP 8.1.2. Changing it back to php7.4 resolved this. Thanks!