fix: Handle unknown item types gracefully in DeserializeBaseItem

When querying items with recursive=true, items with types from removed
plugins would cause a 500 error. Now these items are skipped with a
warning log instead of throwing an exception.

Fixes #15945

1 files changed, 5 insertions, 2 deletions

diff --git a/Jellyfin.Server/Migrations/Routines/MigrateLibraryDb.cs b/Jellyfin.Server/Migrations/Routines/MigrateLibraryDb.cs
index d221d1853..4b1e53a35 100644
--- a/Jellyfin.Server/Migrations/Routines/MigrateLibraryDb.cs
+++ b/Jellyfin.Server/Migrations/Routines/MigrateLibraryDb.cs
@@ -1247,8 +1247,11 @@ internal class MigrateLibraryDb : IDatabaseMigrationRoutine
         }
 
         var baseItem = BaseItemRepository.DeserializeBaseItem(entity, _logger, null, false);
-        var dataKeys = baseItem.GetUserDataKeys();
-        userDataKeys.AddRange(dataKeys);
+        if (baseItem is not null)
+        {
+            var dataKeys = baseItem.GetUserDataKeys();
+            userDataKeys.AddRange(dataKeys);
+        }
 
         return (entity, userDataKeys.ToArray());
     }