diff --git a/grimoire_elk/enriched/gitlabcomments.py b/grimoire_elk/enriched/gitlabcomments.py
index 5345ee198..2791f8622 100644
--- a/grimoire_elk/enriched/gitlabcomments.py
+++ b/grimoire_elk/enriched/gitlabcomments.py
@@ -22,7 +22,7 @@
 import logging
 import re
 
-from grimoirelab_toolkit.datetime import str_to_datetime
+from grimoirelab_toolkit.datetime import str_to_datetime, datetime_utcnow
 
 from .utils import get_time_diff_days
 
@@ -69,7 +69,7 @@ def get_elastic_mappings(es_major):
                     "type": "keyword"
                }
             }
-        }        
+        }
         """
 
         return {"items": mapping}
@@ -313,7 +313,7 @@ def __get_rich_merge(self, item):
 
         if merge_request['state'] != 'closed':
             rich_mr['time_open_days'] = \
-                get_time_diff_days(pull_request['created_at'], datetime_utcnow().replace(tzinfo=None))
+                get_time_diff_days(merge_request['created_at'], datetime_utcnow().replace(tzinfo=None))
         else:
             rich_mr['time_open_days'] = rich_mr['time_to_close_days']
 
@@ -383,9 +383,9 @@ def __get_rich_merge(self, item):
 
         rich_mr['time_to_merge_request_response'] = None
         if merge_request['notes_data'] != 0:
-            min_review_date = self.get_time_to_merge_request_response(pull_request)
-            rich_pr['time_to_merge_request_response'] = \
-                get_time_diff_days(str_to_datetime(pull_request['created_at']), min_review_date)
+            min_review_date = self.get_time_to_merge_request_response(merge_request)
+            rich_mr['time_to_merge_request_response'] = \
+                get_time_diff_days(str_to_datetime(merge_request['created_at']), min_review_date)
 
         if self.prjs_map:
             rich_mr.update(self.get_item_project(rich_mr))