Laravel Integrity constraint violation on db migration

SQLSTATE[23000]: Integrity constraint violation: 1217 Cannot delete or update a parent row: a foreign key constraint fails (SQL: drop table `users`)

I know this has been answered several times, but still i cant figure our whats wrong with my migration.

First i call the partner migration

public function up()
{
    Schema::create('partners', function (Blueprint $table) {
        $table->engine = 'InnoDB';
        $table->increments('id');
        $table->integer('admin_id')->unsigned();
        $table->string('company_name', 50);
        ...
}
public function down()
{
    Schema::drop('partners');
}

Then i call the Users migration

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->engine = 'InnoDB';
        $table->increments('id');
        $table->integer('partner_id')->unsigned();
        $table->string('email', 70)->unique();
        ....
}

public function down()
{
    Schema::table('users', function(Blueprint $table) {
        $table->dropForeign('users_partner_id_foreign');
    });

    Schema::drop('users');
}

Can anybody figure out whats wrong with this? i am using laravel 5.3 and php7

via Chebli Mohamed