diff --git a/changelog b/changelog
index 5cbfb397..a440652d 100644
--- a/changelog
+++ b/changelog
@@ -743,5 +743,8 @@ IM 1.15.0:
     * Enable to set root disk size in EC2, Azure and GCE conns.
     * Return error if instance is not get in stop, start, reboot ops in EC2 conn
     * Fix error in OSCAR or Lambda cons with env variables with ":"
-    * Improve performance in Infrastructure List operation
+    * Improve performance in Infrastructure List operation.
+        WARNING: It requires a DB update.
+        Please make a copy of the DB before applying the script.
+        Use scripts/db_1_14_X_to_1_15_X.py to update it.
     * Add requests-cache to improve performance in TOSCA parsing
\ No newline at end of file
diff --git a/scripts/db_1_14_X_to_1_15_X.py b/scripts/db_1_14_X_to_1_15_X.py
index 72ee3794..2282d8c6 100644
--- a/scripts/db_1_14_X_to_1_15_X.py
+++ b/scripts/db_1_14_X_to_1_15_X.py
@@ -38,7 +38,7 @@ def get_data_from_db(db, inf_id):
     if len(res) > 0:
         elem = res[0]
         if db.db_type == DataBase.MONGO:
-            data = elem[data]
+            data = elem["data"]
         else:
             data = elem[0]
         try:
@@ -82,7 +82,7 @@ def get_data_from_db(db, inf_id):
                             res = db.update("inf_list", {"id": inf_id}, {"auth": auth})
                         else:
                             res = db.execute("UPDATE `inf_list` SET `auth` = %s WHERE id = %s", (auth, inf_id))
-                except Exception as e:
+                except Exception:
                     sys.stderr.write("Error updating auth field in Inf ID: %s. Ignoring.\n" % inf_id)
         else:
             sys.stdout.write("There are no inf_list table. Do not need to update.")