diff --git a/server/szurubooru/func/snapshots.py b/server/szurubooru/func/snapshots.py
index b6a13e00..946c9ade 100644
--- a/server/szurubooru/func/snapshots.py
+++ b/server/szurubooru/func/snapshots.py
@@ -29,7 +29,7 @@ def get_post_snapshot(post: model.Post) -> Dict[str, Any]:
         'source': post.source,
         'safety': post.safety,
         'checksum': post.checksum,
-        'flags': sorted(post.flags.split(',')),
+        'flags': sorted([x for x in post.flags.split(',') if x]),
         'featured': post.is_featured,
         'tags': sorted([tag.first_name for tag in post.tags]),
         'relations': sorted([rel.post_id for rel in post.relations]),
diff --git a/server/szurubooru/tests/conftest.py b/server/szurubooru/tests/conftest.py
index 27a107aa..c6208c41 100644
--- a/server/szurubooru/tests/conftest.py
+++ b/server/szurubooru/tests/conftest.py
@@ -202,7 +202,7 @@ def post_factory(skip_post_hashing):
         post.safety = safety
         post.type = type
         post.checksum = checksum
-        post.flags = []
+        post.flags = ''
         post.mime_type = 'application/octet-stream'
         post.creation_time = datetime(1996, 1, 1)
         return post
diff --git a/server/szurubooru/tests/func/test_posts.py b/server/szurubooru/tests/func/test_posts.py
index d0c27ba6..a79fdf96 100644
--- a/server/szurubooru/tests/func/test_posts.py
+++ b/server/szurubooru/tests/func/test_posts.py
@@ -112,7 +112,7 @@ def test_serialize_post(
         post.user = user_factory(name='post author')
         post.canvas_width = 200
         post.canvas_height = 300
-        post.flags = ['loop']
+        post.flags = 'loop'
         db.session.add(post)
 
         db.session.flush()
@@ -654,7 +654,7 @@ def test_update_post_notes_with_invalid_content(input):
 def test_update_post_flags():
     post = model.Post()
     posts.update_post_flags(post, ['loop'])
-    assert post.flags == ['loop']
+    assert post.flags == 'loop'
 
 
 def test_update_post_flags_with_invalid_content():