diff --git a/client/html/comment.tpl b/client/html/comment.tpl
index 6bea7045..df7b3664 100644
--- a/client/html/comment.tpl
+++ b/client/html/comment.tpl
@@ -26,7 +26,7 @@
                         %><a href='<%- ctx.formatClientLink('user', ctx.user.name) %>'><%
                     %><% } %><%
 
-                    %><%- ctx.user ? ctx.user.name : 'Deleted user' %><%
+                    %><%- ctx.user ? ctx.user.name : 'Anonymous' %><%
 
                     %><% if (ctx.user && ctx.user.name && ctx.canViewUsers) { %><%
                         %></a><%
diff --git a/server/szurubooru/api/comment_api.py b/server/szurubooru/api/comment_api.py
index d60d23ed..0dbc93de 100644
--- a/server/szurubooru/api/comment_api.py
+++ b/server/szurubooru/api/comment_api.py
@@ -48,7 +48,7 @@ def create_comment(
     text = ctx.get_param_as_string("text")
     post_id = ctx.get_param_as_int("postId")
     post = posts.get_post_by_id(post_id)
-    comment = comments.create_comment(ctx.user, post, text)
+    comment = comments.create_comment(ctx.user if ctx.user.name else None, post, text)
     ctx.session.add(comment)
     ctx.session.commit()
     return _serialize(ctx, comment)
diff --git a/server/szurubooru/func/posts.py b/server/szurubooru/func/posts.py
index be2259cf..fdaf9a91 100644
--- a/server/szurubooru/func/posts.py
+++ b/server/szurubooru/func/posts.py
@@ -794,6 +794,8 @@ def update_post_flags(post: model.Post, flags: List[str]) -> None:
 
 def feature_post(post: model.Post, user: Optional[model.User]) -> None:
     assert post
+    if user and not user.name:
+        user = None
     post_feature = model.PostFeature()
     post_feature.time = datetime.utcnow()
     post_feature.post = post
diff --git a/server/szurubooru/func/snapshots.py b/server/szurubooru/func/snapshots.py
index afb26ea5..f5f4c824 100644
--- a/server/szurubooru/func/snapshots.py
+++ b/server/szurubooru/func/snapshots.py
@@ -107,6 +107,9 @@ def _create(
         entity
     )
 
+    if auth_user and not auth_user.name:
+        auth_user = None
+
     snapshot = model.Snapshot()
     snapshot.creation_time = datetime.utcnow()
     snapshot.operation = operation
diff --git a/server/szurubooru/func/users.py b/server/szurubooru/func/users.py
index 5cbe3cc0..1c9ba116 100644
--- a/server/szurubooru/func/users.py
+++ b/server/szurubooru/func/users.py
@@ -43,12 +43,14 @@ def get_avatar_path(user_name: str) -> str:
 def get_avatar_url(user: model.User) -> str:
     assert user
     if user.avatar_style == user.AVATAR_GRAVATAR:
-        assert user.email or user.name
+        if not user.email and not user.name:
+            return ""
         return "https://gravatar.com/avatar/%s?d=retro&s=%d" % (
             util.get_md5((user.email or user.name).lower()),
             config.config["thumbnails"]["avatar_width"],
         )
-    assert user.name
+    if not user.name:
+        return ""
     return "%s/avatars/%s.png" % (
         config.config["data_url"].rstrip("/"),
         user.name.lower(),
diff --git a/server/szurubooru/migrations/versions/5b5c940b4e78_make_featuring_users_nullable.py b/server/szurubooru/migrations/versions/5b5c940b4e78_make_featuring_users_nullable.py
new file mode 100644
index 00000000..2312c7dc
--- /dev/null
+++ b/server/szurubooru/migrations/versions/5b5c940b4e78_make_featuring_users_nullable.py
@@ -0,0 +1,26 @@
+'''
+make featuring users nullable
+
+Revision ID: 5b5c940b4e78
+Created at: 2025-04-04 08:24:39.000603
+'''
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = '5b5c940b4e78'
+down_revision = 'adcd63ff76a2'
+branch_labels = None
+depends_on = None
+
+def upgrade():
+    op.alter_column(
+        "post_feature", "user_id", nullable=True, existing_nullable=False
+    )
+    pass
+
+def downgrade():
+    op.alter_column(
+        "post_feature", "user_id", nullable=False, existing_nullable=True
+    )
+    pass
diff --git a/server/szurubooru/model/comment.py b/server/szurubooru/model/comment.py
index e64961e6..d35c5af1 100644
--- a/server/szurubooru/model/comment.py
+++ b/server/szurubooru/model/comment.py
@@ -46,7 +46,7 @@ class Comment(Base):
     user_id = sa.Column(
         "user_id",
         sa.Integer,
-        sa.ForeignKey("user.id"),
+        sa.ForeignKey("user.id", ondelete="SET NULL"),
         nullable=True,
         index=True,
     )
diff --git a/server/szurubooru/model/post.py b/server/szurubooru/model/post.py
index 49e748dc..eb394167 100644
--- a/server/szurubooru/model/post.py
+++ b/server/szurubooru/model/post.py
@@ -24,8 +24,8 @@ class PostFeature(Base):
     user_id = sa.Column(
         "user_id",
         sa.Integer,
-        sa.ForeignKey("user.id"),
-        nullable=False,
+        sa.ForeignKey("user.id", ondelete="SET NULL"),
+        nullable=True,
         index=True,
     )
     time = sa.Column("time", sa.DateTime, nullable=False)