diff --git a/searx/engines/mysql_server.py b/searx/engines/mysql_server.py
index e65217bb..70c7e26e 100644
--- a/searx/engines/mysql_server.py
+++ b/searx/engines/mysql_server.py
@@ -3,6 +3,10 @@
  MySQL database (Offline)
 """
 
+# error is ignored because the admin has to
+# install it manually to use the engine
+# pylint: disable=import-error
+
 import mysql.connector
 
 
@@ -49,7 +53,7 @@ def search(query, params):
 def _fetch_results(cur):
     results = []
     for res in cur:
-        result = dict(zip(cur.column_names, map(str, res))),
+        result = dict(zip(cur.column_names, map(str, res)))
         result['template'] = result_template
         results.append(result)
 
diff --git a/searx/engines/postgresql.py b/searx/engines/postgresql.py
index e49a01d2..2c95f415 100644
--- a/searx/engines/postgresql.py
+++ b/searx/engines/postgresql.py
@@ -3,6 +3,10 @@
  PostgreSQL database (Offline)
 """
 
+# error is ignored because the admin has to
+# install it manually to use the engine
+# pylint: disable=import-error
+
 import psycopg2
 
 engine_type = 'offline'
@@ -41,7 +45,7 @@ def search(query, params):
 
     with _connection:
         with _connection.cursor() as cur:
-            cur.execute(query_str, query_params)
+            cur.execute(query_to_run, query_params)
 
             return _fetch_results(cur)