Script php artisan optimize --force handling the post-install-cmd event returned with error code 255

[koltl]

When running composer install --no-dev -o,

I get this

Generating optimized autoload files

Illuminate\Foundation\ComposerScripts::postInstall
php artisan optimize --force
Generating optimized class loader
Compiling common classes
PHP Fatal error: Uncaught ErrorException: count(): Parameter must be an array or an object that implements Countable in /var/www/Cachet/vendor/graham-campbell/exceptions/src/ExceptionIdentifier.php:51
Stack trace:
#0 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
#1 /var/www/Cachet/vendor/graham-campbell/exceptions/src/ExceptionIdentifier.php(51): count()
#2 /var/www/Cachet/vendor/graham-campbell/exceptions/src/ExceptionHandlerTrait.php(47): GrahamCampbell\Exceptions\ExceptionIdentifier->identify()
#3 /var/www/Cachet/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(79): GrahamCampbell\Exceptions\ExceptionHandler->report()
#4 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleException()
#5 {main}
thrown in /var/www/Cachet/vendor/graham-campbell/exceptions/src/ExceptionIdentifier.php on line 51
PHP Fatal error: Uncaught ErrorException: count(): Parameter must be an array or an object that implements Countable in /var/www/Cachet/vendor/graham-campbell/exceptions/src/ExceptionIdentifier.php:51
Stack trace:
#0 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
#1 /var/www/Cachet/vendor/graham-campbell/exceptions/src/ExceptionIdentifier.php(51): count()
#2 /var/www/Cachet/vendor/graham-campbell/exceptions/src/ExceptionHandlerTrait.php(47): GrahamCampbell\Exceptions\ExceptionIdentifier->identify()
#3 /var/www/Cachet/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(79): GrahamCampbell\Exceptions\ExceptionHandler->report()
#4 /var/www/Cachet/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/HandleExceptions.php(118): Illuminate\Foundation\Bootstrap\HandleExceptions->handleException()
#5 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleShutdown()
#6 {main}
thrown in /var/www/Cachet/vendor/graham-campbell/exceptions/src/ExceptionIdentifier.php on line 51
Script php artisan optimize --force handling the post-install-cmd event returned with error code 255

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