Error whille running composer install on PHP 7.2 Ubuntu

I kept getting this error at the end of my composer install on PHP 7.2 - Laravel 5.1

> php artisan clear-compiled
PHP Fatal error:  Uncaught TypeError: Argument 1 passed to App\Exceptions\Handler::report() must be an instance of Exception, instance of Error given, called in /home/forge/bheng/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php on line 73 and defined in /home/forge/bheng/app/Exceptions/Handler.php:29
Stack trace:
#0 /home/forge/bheng/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(73): App\Exceptions\Handler->report(Object(Error))
#1 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleException(Object(Error))
#2 {main}
  thrown in /home/forge/bheng/app/Exceptions/Handler.php on line 29
[2019-01-31 10:29:34] production.ERROR: Symfony\Component\Debug\Exception\FatalErrorException: Uncaught TypeError: Argument 1 passed to App\Exceptions\Handler::report() must be an instance of Exception, instance of Error given, called in /home/forge/bheng/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php on line 73 and defined in /home/forge/bheng/app/Exceptions/Handler.php:29
Stack trace:
#0 /home/forge/bheng/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(73): App\Exceptions\Handler->report(Object(Error))
#1 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleException(Object(Error))
#2 {main}
  thrown in /home/forge/bheng/app/Exceptions/Handler.php:29
Stack trace:
#0 {main}  



  [Symfony\Component\Debug\Exception\FatalErrorException]                                                                                                                                                                                                                                                                       
  Uncaught TypeError: Argument 1 passed to App\Exceptions\Handler::report() must be an instance of Exception, instance of Error given, called in /home/forge/bheng/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php on line 73 and defined in /home/forge/bheng/app/Exceptions/Handler.php:29  
  Stack trace:                                                                                                                                                                                                                                                                                                                  
  #0 /home/forge/bheng/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(73): App\Exceptions\Handler->report(Object(Error))                                                                                                                                                                     
  #1 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleException(Object(Error))                                                                                                                                                                                                                      
  #2 {main}                                                                                                                                                                                                                                                                                                                     
    thrown                                                                                                                                                                                                                                                                                                                      


Script php artisan clear-compiled handling the post-update-cmd event returned with error code 255
┌──[root@bheng]──[/home/forge/bheng] 
└──  

How can I prevent that ?

via Chebli Mohamed