diff --git a/framework/core/migrations/2018_07_16_003952_allow_hide_posts_for_moderators.php b/framework/core/migrations/2018_07_16_003952_allow_hide_posts_for_moderators.php
deleted file mode 100644
index 57203b7b1..000000000
--- a/framework/core/migrations/2018_07_16_003952_allow_hide_posts_for_moderators.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-/*
- * This file is part of Flarum.
- *
- * (c) Toby Zerner <toby.zerner@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-use Flarum\Database\Migration;
-use Flarum\Group\Group;
-
-return Migration::addPermissions([
-    'discussion.hidePosts' => Group::MODERATOR_ID
-]);
diff --git a/framework/core/migrations/2018_07_21_000000_seed_default_groups.php b/framework/core/migrations/2018_07_21_000000_seed_default_groups.php
new file mode 100644
index 000000000..12566ba02
--- /dev/null
+++ b/framework/core/migrations/2018_07_21_000000_seed_default_groups.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Flarum\Group\Group;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $db = $schema->getConnection();
+
+        $groups = [
+            [Group::ADMINISTRATOR_ID, 'Admin', 'Admins', '#B72A2A', 'fas fa-wrench'],
+            [Group::GUEST_ID, 'Guest', 'Guests', null, null],
+            [Group::MEMBER_ID, 'Member', 'Members', null, null],
+            [Group::MODERATOR_ID, 'Mod', 'Mods', '#80349E', 'fas fa-bolt']
+        ];
+
+        foreach ($groups as $group) {
+            if ($db->table('groups')->where('id', $group[0])->exists()) {
+                continue;
+            }
+
+            $db->table('groups')->insert(array_combine(['id', 'name_singular', 'name_plural', 'color', 'icon'], $group));
+        }
+    },
+
+    'down' => function (Builder $schema) {
+        // do nothing so as to preserve user data
+    }
+];
diff --git a/framework/core/migrations/2015_02_25_000000_setup_default_permissions.php b/framework/core/migrations/2018_07_21_000100_seed_default_group_permissions.php
similarity index 100%
rename from framework/core/migrations/2015_02_25_000000_setup_default_permissions.php
rename to framework/core/migrations/2018_07_21_000100_seed_default_group_permissions.php
diff --git a/framework/core/src/Database/Migration.php b/framework/core/src/Database/Migration.php
index 6469b847f..58f23acba 100644
--- a/framework/core/src/Database/Migration.php
+++ b/framework/core/src/Database/Migration.php
@@ -137,11 +137,11 @@ abstract class Migration
      */
     public static function addPermissions(array $permissions)
     {
-        $keys = [];
+        $rows = [];
 
         foreach ($permissions as $permission => $groups) {
             foreach ((array) $groups as $group) {
-                $keys[] = [
+                $rows[] = [
                     'group_id' => $group,
                     'permission' => $permission,
                 ];
@@ -149,23 +149,27 @@ abstract class Migration
         }
 
         return [
-            'up' => function (Builder $schema) use ($keys) {
+            'up' => function (Builder $schema) use ($rows) {
                 $db = $schema->getConnection();
 
-                foreach ($keys as $key) {
-                    $instance = $db->table('permissions')->where($key)->first();
-
-                    if (is_null($instance)) {
-                        $db->table('permissions')->insert($key);
+                foreach ($rows as $row) {
+                    if ($db->table('group_permission')->where($row)->exists()) {
+                        continue;
                     }
+
+                    if ($db->table('groups')->where('id', $row['group_id'])->doesntExist()) {
+                        continue;
+                    }
+
+                    $db->table('group_permission')->insert($row);
                 }
             },
 
-            'down' => function (Builder $schema) use ($keys) {
+            'down' => function (Builder $schema) use ($rows) {
                 $db = $schema->getConnection();
 
-                foreach ($keys as $key) {
-                    $db->table('permissions')->where($key)->delete();
+                foreach ($rows as $row) {
+                    $db->table('group_permission')->where($row)->delete();
                 }
             }
         ];
diff --git a/framework/core/src/Install/Console/InstallCommand.php b/framework/core/src/Install/Console/InstallCommand.php
index 758c1702c..b91ec48b6 100644
--- a/framework/core/src/Install/Console/InstallCommand.php
+++ b/framework/core/src/Install/Console/InstallCommand.php
@@ -193,8 +193,6 @@ class InstallCommand extends AbstractCommand
             $this->application->register(SearchServiceProvider::class);
             $this->application->register(PostServiceProvider::class);
 
-            $this->seedGroups();
-
             $this->createAdminUser();
 
             $this->enableBundledExtensions();
@@ -280,28 +278,6 @@ class InstallCommand extends AbstractCommand
         }
     }
 
-    protected function seedGroups()
-    {
-        Group::unguard();
-
-        $groups = [
-            [Group::ADMINISTRATOR_ID, 'Admin', 'Admins', '#B72A2A', 'fas fa-wrench'],
-            [Group::GUEST_ID, 'Guest', 'Guests', null, null],
-            [Group::MEMBER_ID, 'Member', 'Members', null, null],
-            [Group::MODERATOR_ID, 'Mod', 'Mods', '#80349E', 'fas fa-bolt']
-        ];
-
-        foreach ($groups as $group) {
-            Group::create([
-                'id' => $group[0],
-                'name_singular' => $group[1],
-                'name_plural' => $group[2],
-                'color' => $group[3],
-                'icon' => $group[4],
-            ]);
-        }
-    }
-
     protected function createAdminUser()
     {
         $admin = $this->adminUser;