diff --git a/Kyoo.Common/Models/LibraryLink.cs b/Kyoo.Common/Models/LibraryLink.cs
index 86635adf..fb068038 100644
--- a/Kyoo.Common/Models/LibraryLink.cs
+++ b/Kyoo.Common/Models/LibraryLink.cs
@@ -1,3 +1,6 @@
+using System;
+
+#nullable enable
 namespace Kyoo.Models
 {
 	public class LibraryLink
diff --git a/Kyoo/Controllers/LibraryManager.cs b/Kyoo/Controllers/LibraryManager.cs
index a20e8cda..3eea207b 100644
--- a/Kyoo/Controllers/LibraryManager.cs
+++ b/Kyoo/Controllers/LibraryManager.cs
@@ -345,12 +345,12 @@ namespace Kyoo.Controllers
 
 		public void RegisterShowLinks(Library library, Collection collection, Show show)
 		{
-			if (collection != null) 
+			if (collection != null)
 			{
-				_database.LibraryLinks.Add(new LibraryLink {LibraryID = library.ID, CollectionID = collection.ID});
-				_database.CollectionLinks.Add(new CollectionLink { CollectionID = collection.ID, ShowID = show.ID});
+				_database.LibraryLinks.AddIfNotExist(new LibraryLink {LibraryID = library.ID, CollectionID = collection.ID}, x => x.LibraryID == library.ID && x.CollectionID == collection.ID && x.ShowID == null);
+				_database.CollectionLinks.AddIfNotExist(new CollectionLink { CollectionID = collection.ID, ShowID = show.ID}, x => x.CollectionID == collection.ID && x.ShowID == show.ID);
 			}
-			_database.LibraryLinks.Add(new LibraryLink {LibraryID = library.ID, ShowID = show.ID});
+			_database.LibraryLinks.AddIfNotExist(new LibraryLink {LibraryID = library.ID, ShowID = show.ID}, x => x.LibraryID == library.ID && x.CollectionID == null && x.ShowID == show.ID);
 			_database.SaveChanges();
 		}
 		
diff --git a/Kyoo/DatabaseContext.cs b/Kyoo/DatabaseContext.cs
index 59e85424..2ad99f43 100644
--- a/Kyoo/DatabaseContext.cs
+++ b/Kyoo/DatabaseContext.cs
@@ -50,4 +50,13 @@ namespace Kyoo
                 .ValueGeneratedNever();
         }
     }
+}
+
+public static class DbSetExtension
+{
+	public static EntityEntry<T> AddIfNotExist<T>(this DbSet<T> db, T entity, Func<T, bool> predicate) where T : class
+	{
+		bool exists = db.Any(predicate);
+		return exists ? null : db.Add(entity);
+	}
 }
\ No newline at end of file