diff --git a/pyMetadata/sources/anii.py b/pyMetadata/sources/anii.py
index 57a2485d..020816d7 100644
--- a/pyMetadata/sources/anii.py
+++ b/pyMetadata/sources/anii.py
@@ -15,7 +15,7 @@ class metadata():
 
             meta = Metadata(
                 title = result.get("name_english", None),
-                altTitle = [result.get("name_romaji", None)],
+                altTitle = [result.get("name_romaji", [])],
                 cover = result.get("cover_image", None),
                 summary = result.get("desc", None),
                 type = 'movie' if result.get('airing_format', '').lower() == 'movie' else 'serie',
diff --git a/pyMetadata/sources/imdb.py b/pyMetadata/sources/imdb.py
index 543287f5..c80ef2f1 100644
--- a/pyMetadata/sources/imdb.py
+++ b/pyMetadata/sources/imdb.py
@@ -17,7 +17,7 @@ class metadata():
             result = self.imdb.get_movie(imdbId)
             meta = Metadata(
                 title = result.get("title", None),
-                altTitle = [result.get("localized title", None)],
+                altTitle = [result.get("localized title", [])],
                 cover = result.get("cover url", None),
                 summary = result.get("plot outline", None),
                 type = 'movie' if result.get('kind', '').lower() == 'movie' else 'serie',
diff --git a/pyMetadata/sources/mal.py b/pyMetadata/sources/mal.py
index ff597fc9..0e04941c 100644
--- a/pyMetadata/sources/mal.py
+++ b/pyMetadata/sources/mal.py
@@ -15,10 +15,7 @@ class metadata():
             anime = Anime(search.results[0].mal_id)
             meta = Metadata(
                 title = anime.title,
-                altTitle = [
-                    anime.title_english,
-                    *anime.title_synonyms
-                ],
+                altTitle = [altName for altName in [anime.title_english, *anime.title_synonyms] if altName],
                 cover = anime.image_url,
                 summary = anime.synopsis,
                 type = 'movie' if anime.type.lower() == 'movie' else 'serie',
diff --git a/pyMetadata/sources/result.py b/pyMetadata/sources/result.py
index 7384d05f..5cba5f1a 100644
--- a/pyMetadata/sources/result.py
+++ b/pyMetadata/sources/result.py
@@ -4,7 +4,7 @@ from dataclasses import dataclass, asdict
 @dataclass
 class Metadata:
     title: str
-    altTitle: List[str]
+    altTitle: List[str] = []
     cover: str
     type: str  # Serie/Movie
     summary: str