Silent Fail on Order Creation

[pkarnia]

From laravel logs:
[2019-10-04 11:56:30] laravel.ERROR: Serialization of 'Closure' is not allowed {"userId":3648,"exception":"[object] (Exception(code: 0): Serialization of 'Closure' is not allowed at /srv/http/ipromanager/vendor/laravel/framework/src/Illuminate/Session/Store.php:129)
[stacktrace]
#0 /srv/http/ipromanager/vendor/laravel/framework/src/Illuminate/Session/Store.php(129): serialize(Array)
#1 /srv/http/ipromanager/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(87): Illuminate\Session\Store->save()
#2 /srv/http/ipromanager/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(218): Illuminate\Session\Middleware\StartSession->terminate(Object(Illuminate\Http\Request), Object(Illuminate\Http\RedirectResponse))
#3 /srv/http/ipromanager/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(189): Illuminate\Foundation\Http\Kernel->terminateMiddleware(Object(Illuminate\Http\Request), Object(Illuminate\Http\RedirectResponse))
#4 /srv/http/ipromanager/public/index.php(60): Illuminate\Foundation\Http\Kernel->terminate(Object(Illuminate\Http\Request), Object(Illuminate\Http\RedirectResponse))
#5 {main}
"}

[pkarnia]

Seems to be limited case scenario but logs are not revealing what cause is. Student will send info used when attempting to create the order.