Laravel Migration Foreignkey Error

Laravel 5.6 running on: PHP 7.2, MariaDB 10.3

When I want to set foreign key for my table, I just keep taking that error.

On other tables, all id variables defined by Laravel itself and auto increments unsigned

So, my Migration is like this:

public function up()
{

    Schema::create('user_roles', function (Blueprint $table) {
        $table->increments('id');
        $table->unsignedInteger('role_id');
        $table->unsignedInteger('user_id');

        $table->foreign('role_id')->references('id')->on('roles')->onDelete('cascade');
        $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
    });
}

The error is like this:
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') on delete cascade' at lin e 1 (SQL: alter table user_roles add constraint user_roles_role_id_foreign foreign key (role_id) references roles () on delete cascade)

Errors thrown by Laravel:
1 PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') on delete cascade' at line 1") C:\xampp\htdocs\order-project\vendor\laravel\framework\src\Illuminate\Database\Connection.php:452

2 PDO::prepare("alter table user_roles add constraint user_roles_role_id_foreign foreign key (role_id) references roles () on delete cascade") C:\xampp\htdocs\order-project\vendor\laravel\framework\src\Illuminate\Database\Connection.php:452

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