diff --git a/series_tiempo_ar_api/apps/api/query/es_query/response_formatter.py b/series_tiempo_ar_api/apps/api/query/es_query/response_formatter.py
index 012d47cc..5bd0d943 100644
--- a/series_tiempo_ar_api/apps/api/query/es_query/response_formatter.py
+++ b/series_tiempo_ar_api/apps/api/query/es_query/response_formatter.py
@@ -33,10 +33,11 @@ def format_response(self):
                     timestamp_dict = self.data_dict.setdefault(hit['key_as_string'], {})
                     timestamp_dict[self._data_dict_series_key(self.series[i])] = data
             else:
+                response = filter(lambda hit, mode=rep_mode: mode in hit, response)
                 for hit in response:
-                    data = hit[rep_mode] if rep_mode in hit else None
                     timestamp_dict = self.data_dict.setdefault(hit.timestamp, {})
-                    timestamp_dict[self._data_dict_series_key(self.series[i])] = data
+                    series = self._data_dict_series_key(self.series[i])
+                    timestamp_dict[series] = hit[rep_mode]
 
         if not self.data_dict:  # No hay datos
             return []
diff --git a/series_tiempo_ar_api/apps/api/tests/es_query_tests.py b/series_tiempo_ar_api/apps/api/tests/es_query_tests.py
index ece2564e..65aa4396 100644
--- a/series_tiempo_ar_api/apps/api/tests/es_query_tests.py
+++ b/series_tiempo_ar_api/apps/api/tests/es_query_tests.py
@@ -342,8 +342,8 @@ def test_end_of_period_with_rep_mode(self):
         orig_eop.sort('asc')
         end_of_period = orig_eop.run()
 
-        for i, row in enumerate(data[1:], 1):  # El primero es nulo en pct change
-            value = end_of_period[i][1] / end_of_period[i - 1][1] - 1
+        for i, row in enumerate(data):  # El primero es nulo en pct change
+            value = end_of_period[i + 1][1] / end_of_period[i][1] - 1
 
             self.assertAlmostEqual(value, row[1])
 
@@ -462,3 +462,15 @@ def test_min_max_collapse_agg_with_rep_mode(self):
         min_val = max([row[1] for row in data])
 
         self.assertAlmostEqual(min_val, other_data[0][1], places=5)
+
+    def test_rep_mode_has_no_leading_nulls(self):
+        self.query.add_series(self.single_series, 'percent_change', self.series_periodicity)
+        data = self.query.run()
+
+        self.assertIsNotNone(data[0][1])
+
+    def test_year_rep_mode_has_no_leading_nulls(self):
+        self.query.add_series(self.single_series, 'percent_change_a_year_ago', self.series_periodicity)
+        data = self.query.run()
+
+        self.assertIsNotNone(data[0][1])
diff --git a/series_tiempo_ar_api/apps/api/tests/pipeline_tests/ids_tests.py b/series_tiempo_ar_api/apps/api/tests/pipeline_tests/ids_tests.py
index b4ec2628..75259922 100644
--- a/series_tiempo_ar_api/apps/api/tests/pipeline_tests/ids_tests.py
+++ b/series_tiempo_ar_api/apps/api/tests/pipeline_tests/ids_tests.py
@@ -57,8 +57,8 @@ def test_global_rep_mode(self):
         other_query.sort('asc')
         other_data = other_query.run()['data']
 
-        for index, row in enumerate(other_data[1:], start=1):
-            change = data[index][1] - data[index - 1][1]
+        for index, row in enumerate(other_data):
+            change = data[index + 1][1] - data[index][1]
             # La resta anterior trae pérdida de precisión si los números de 'data' son grandes
             self.assertAlmostEqual(row[1], change, places=5)