diff --git a/database/migrations/2021_07_06_000000_add_title_position_to_slideshows.php b/database/migrations/2021_07_06_000000_add_title_position_to_slideshows.php
index 2da782a..5eb7aba 100644
--- a/database/migrations/2021_07_06_000000_add_title_position_to_slideshows.php
+++ b/database/migrations/2021_07_06_000000_add_title_position_to_slideshows.php
@@ -15,7 +15,7 @@ public function up()
         $prefix = config('nova-cms-portfolio.db_prefix');
 
         Schema::table($prefix.'slideshows', function (Blueprint $table) {
-            $table->string('title_position')->default('bottom_left');
+            $table->string('title_position')->default('bottom_left')->nullable();
         });
     }
 
diff --git a/src/Models/Slideshow.php b/src/Models/Slideshow.php
index c85b456..dce7f77 100644
--- a/src/Models/Slideshow.php
+++ b/src/Models/Slideshow.php
@@ -117,11 +117,4 @@ public function workForNews()
 
         return $markedWork;
     }
-
-    public function workForDisciplineUrl($disciplineId)
-    {
-        $work = $this->workForDiscipline($disciplineId);
-
-        return $work && $work->file ? nova_cms_image($work->file) : null;
-    }
 }
diff --git a/src/Nova/Slideshow.php b/src/Nova/Slideshow.php
index 0c0f3e1..08d4061 100644
--- a/src/Nova/Slideshow.php
+++ b/src/Nova/Slideshow.php
@@ -61,8 +61,6 @@ public function fields(Request $request)
 
             Slug::make(__('nova-cms::pages.slug'), 'slug')->from('title')
                 ->rules('required')
-                ->creationRules('unique:'.config('nova-cms-portfolio.db_prefix').'slideshows,slug')
-                ->updateRules('unique:'.config('nova-cms-portfolio.db_prefix').'slideshows,slug,{{resourceId}}')
                 ->onlyOnForms(),
 
             Boolean::make(ucfirst(__('nova-cms-portfolio::portfolio.published')), 'is_published')