NunoMaduro / Неустранимая ошибка столкновения на php artisan: выполнить миграцию

Когда я запускаю команду php artisan:make migration, у меня появляется такая ошибка:

PHP Fatal error:  Declaration of NunoMaduro\Collision\Writer::write(Whoops\Exception\Inspector $inspector): NunoMaduro\Collision\void must be compatible with NunoMaduro\Collision\Contracts\Writer::write(Whoops\Exception\Inspector $inspector): NunoMaduro\Collision\Contracts\void in /home/gregory/folbet/vendor/nunomaduro/collision/src/Writer.php on line 27

   Symfony\Component\Debug\Exception\FatalErrorException  : Declaration of NunoMaduro\Collision\Writer::write(Whoops\Exception\Inspector $inspector): NunoMaduro\Collision\void must be compatible with NunoMaduro\Collision\Contracts\Writer::write(Whoops\Exception\Inspector $inspector): NunoMaduro\Collision\Contracts\void

  at /home/gregory/folbet/vendor/nunomaduro/collision/src/Writer.php:27    23|  * This is an Collision Writer implementation.
    24|  *    25|  * @author Nuno Maduro <[email protected]>
    26|  */  > 27| class Writer implements WriterContract    28| {
    29|     /**    30|      * The number of frames if no verbosity is specified.    31|      */

PHP Fatal error:  Uncaught TypeError: Return value of NunoMaduro\Collision\Writer::write() must be an instance of NunoMaduro\Collision\void, none returned in /home/gregory/folbet/vendor/nunomaduro/collision/src/Writer.php:114
Stack trace:
#0 /home/gregory/folbet/vendor/nunomaduro/collision/src/Handler.php(48): NunoMaduro\Collision\Writer->write(Object(NunoMaduro\Collision\Adapters\Laravel\Inspector))
#1 /home/gregory/folbet/vendor/nunomaduro/collision/src/Adapters/Laravel/ExceptionHandler.php(86): NunoMaduro\Collision\Handler->handle()
#2 /home/gregory/folbet/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(101): NunoMaduro\Collision\Adapters\Laravel\ExceptionHandler->renderForConsole(Object(Symfony\Component\Console\Output\ConsoleOutput), Object(Symfony\Component\Debug\Exception\FatalErrorException))
#3 /home/gregory/folbet/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(87): Illuminate\Foundation\Bootstrap\HandleExceptions->renderForConsole(Object(Symfony\Com in /home/gregory/folbet/vendor/nunomaduro/collision/src/Writer.php on line 114

Как я могу это исправить?

Моя версия Laravel - 5.6. *, А моя версия PHP - ^ 7.1.3.