diff --git a/Kyoo/Controllers/Repositories/CollectionRepository.cs b/Kyoo/Controllers/Repositories/CollectionRepository.cs
index 6e0151ef..4b2f4786 100644
--- a/Kyoo/Controllers/Repositories/CollectionRepository.cs
+++ b/Kyoo/Controllers/Repositories/CollectionRepository.cs
@@ -113,6 +113,8 @@ namespace Kyoo.Controllers
 
 		public async Task Delete(Collection obj)
 		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
 			_database.Collections.Remove(obj);
 			await _database.SaveChangesAsync();
 		}
diff --git a/Kyoo/Controllers/Repositories/EpisodeRepository.cs b/Kyoo/Controllers/Repositories/EpisodeRepository.cs
index 94a8c9b4..a60e1b20 100644
--- a/Kyoo/Controllers/Repositories/EpisodeRepository.cs
+++ b/Kyoo/Controllers/Repositories/EpisodeRepository.cs
@@ -155,6 +155,9 @@ namespace Kyoo.Controllers
 		
 		public async Task Delete(Episode obj)
 		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+			
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)
 					_database.Entry(entry).State = EntityState.Deleted;
diff --git a/Kyoo/Controllers/Repositories/GenreRepository.cs b/Kyoo/Controllers/Repositories/GenreRepository.cs
index 91a4a295..116dd0ec 100644
--- a/Kyoo/Controllers/Repositories/GenreRepository.cs
+++ b/Kyoo/Controllers/Repositories/GenreRepository.cs
@@ -113,6 +113,9 @@ namespace Kyoo.Controllers
 
 		public async Task Delete(Genre obj)
 		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Genres.Remove(obj);
 			await _database.SaveChangesAsync();
 		}
diff --git a/Kyoo/Controllers/Repositories/LibraryRepository.cs b/Kyoo/Controllers/Repositories/LibraryRepository.cs
index 4f8a235b..dbbd5989 100644
--- a/Kyoo/Controllers/Repositories/LibraryRepository.cs
+++ b/Kyoo/Controllers/Repositories/LibraryRepository.cs
@@ -128,6 +128,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			if (obj.ProviderLinks != null)
 				foreach (ProviderLink entry in obj.ProviderLinks)
diff --git a/Kyoo/Controllers/Repositories/PeopleRepository.cs b/Kyoo/Controllers/Repositories/PeopleRepository.cs
index 3cd013f5..8f918905 100644
--- a/Kyoo/Controllers/Repositories/PeopleRepository.cs
+++ b/Kyoo/Controllers/Repositories/PeopleRepository.cs
@@ -127,6 +127,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)
diff --git a/Kyoo/Controllers/Repositories/ProviderRepository.cs b/Kyoo/Controllers/Repositories/ProviderRepository.cs
index 51bb38fb..fffd7ffe 100644
--- a/Kyoo/Controllers/Repositories/ProviderRepository.cs
+++ b/Kyoo/Controllers/Repositories/ProviderRepository.cs
@@ -114,6 +114,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			await _database.SaveChangesAsync();
 		}
diff --git a/Kyoo/Controllers/Repositories/SeasonRepository.cs b/Kyoo/Controllers/Repositories/SeasonRepository.cs
index 33d1dd3b..a91163a6 100644
--- a/Kyoo/Controllers/Repositories/SeasonRepository.cs
+++ b/Kyoo/Controllers/Repositories/SeasonRepository.cs
@@ -146,6 +146,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)
diff --git a/Kyoo/Controllers/Repositories/ShowRepository.cs b/Kyoo/Controllers/Repositories/ShowRepository.cs
index 4018d2e8..1be13aba 100644
--- a/Kyoo/Controllers/Repositories/ShowRepository.cs
+++ b/Kyoo/Controllers/Repositories/ShowRepository.cs
@@ -167,6 +167,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			if (obj.GenreLinks != null)
 				foreach (GenreLink entry in obj.GenreLinks)
diff --git a/Kyoo/Controllers/Repositories/StudioRepository.cs b/Kyoo/Controllers/Repositories/StudioRepository.cs
index 4ca73397..2c598756 100644
--- a/Kyoo/Controllers/Repositories/StudioRepository.cs
+++ b/Kyoo/Controllers/Repositories/StudioRepository.cs
@@ -113,6 +113,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			await _database.SaveChangesAsync();
 		}
diff --git a/Kyoo/Controllers/Repositories/TrackRepository.cs b/Kyoo/Controllers/Repositories/TrackRepository.cs
index d44cc45d..25d034e2 100644
--- a/Kyoo/Controllers/Repositories/TrackRepository.cs
+++ b/Kyoo/Controllers/Repositories/TrackRepository.cs
@@ -103,6 +103,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			await _database.SaveChangesAsync();
 		}