diff --git a/Tranga/Publication.cs b/Tranga/Publication.cs
index 692f636..793f616 100644
--- a/Tranga/Publication.cs
+++ b/Tranga/Publication.cs
@@ -37,8 +37,8 @@ public readonly struct Publication
         this.status = status;
         this.publicationId = publicationId;
         this.folderName = string.Concat(sortName.Split(Path.GetInvalidPathChars().Concat(Path.GetInvalidFileNameChars()).ToArray()));
-        string onlyLowerAscii = this.sortName.ToLower().Where(Char.IsAscii).ToString()!;
-        this.internalId = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{onlyLowerAscii}{this.year}"));
+        string onlyLowerLetters = string.Concat(this.sortName.ToLower().Where(Char.IsLetter));
+        this.internalId = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{onlyLowerLetters}{this.year}"));
     }
     
     /// <returns>Serialized JSON String for series.json</returns>
diff --git a/Tranga/TaskManager.cs b/Tranga/TaskManager.cs
index 56d89ce..de0a63d 100644
--- a/Tranga/TaskManager.cs
+++ b/Tranga/TaskManager.cs
@@ -169,6 +169,8 @@ public class TaskManager
                     _chapterCollection.TryAdd((Publication)publication!, new List<Chapter>());
                 _allTasks.Add(newTask);
             }
+            else
+                logger.WriteLine(this.GetType().ToString(), $"Publication already exists {publication?.internalId}");
         }
         logger?.WriteLine(this.GetType().ToString(), $"Added new Task {newTask.ToString()}");
         ExportData();