<?php

use Illuminate\Database\Seeder;

class UserTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        DB::table('users')->delete();

        $data['name'] = 'Tim Joosten';
        $data['email'] = 'Topairy@gmail.com';
        $data['gsm'] = '0474834880';
        $data['password'] = bcrypt('admin');

        DB::table('users')->insert($data);
    }
}

<?php

use Illuminate\Database\Seeder;

class UserTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $data['name'] = 'Tim Joosten';
        $data['email'] = 'Topairy@gmail.com';
        $data['gsm'] = '0474834880';
        $data['password'] = bcrypt('admin');

        DB::table('users')->insert($data);
    }
}

--- 
+++ 
@@ -11,6 +11,8 @@
      */
     public function run()
     {
+        DB::table('users')->delete();
+
         $data['name'] = 'Tim Joosten';
         $data['email'] = 'Topairy@gmail.com';
         $data['gsm'] = '0474834880';
Add truncate method to user table seeder.
