diff --git a/server/szurubooru/func/image_hash.py b/server/szurubooru/func/image_hash.py
index 653ac47c..00626d3f 100644
--- a/server/szurubooru/func/image_hash.py
+++ b/server/szurubooru/func/image_hash.py
@@ -40,9 +40,9 @@ def search_by_image(image_content):
                 'dist': result['dist'],
                 'path': result['path'],
             }
-    except elasticsearch.exceptions.ElasticsearchException as ex:
+    except elasticsearch.exceptions.ElasticsearchException:
         raise
-    except Exception as ex:
+    except Exception:
         raise errors.SearchError('Error searching (invalid input?)')
 
 
diff --git a/server/szurubooru/migrations/env.py b/server/szurubooru/migrations/env.py
index 2f7c1122..1359ab8a 100644
--- a/server/szurubooru/migrations/env.py
+++ b/server/szurubooru/migrations/env.py
@@ -61,6 +61,7 @@ def run_migrations_online():
         with alembic.context.begin_transaction():
             alembic.context.run_migrations()
 
+
 if alembic.context.is_offline_mode():
     run_migrations_offline()
 else:
diff --git a/server/szurubooru/search/configs/post_search_config.py b/server/szurubooru/search/configs/post_search_config.py
index 55a9f463..b0ea3300 100644
--- a/server/szurubooru/search/configs/post_search_config.py
+++ b/server/szurubooru/search/configs/post_search_config.py
@@ -66,7 +66,8 @@ def _create_user_filter():
     def wrapper(query, criterion, negated):
         if isinstance(criterion, criteria.PlainCriterion) \
                 and not criterion.value:
-            expr = db.Post.user_id == None  # sic
+            # pylint: disable=singleton-comparison
+            expr = db.Post.user_id == None
             if negated:
                 expr = ~expr
             return query.filter(expr)