diff --git a/personal/combine/classes.py b/personal/combine/classes.py
index 620348b..121a490 100644
--- a/personal/combine/classes.py
+++ b/personal/combine/classes.py
@@ -255,10 +255,10 @@ class ObjectDict:
 	def get_missing_ids_by_minutes(self, start_minute, end_minute, ignore_ids):
 		start_id = self.by_minute[start_minute].min_id
 		end_id = self.by_minute[end_minute].max_id
-		if start_id is None:
+		if start_id is None or end_id is None:
 			log.warning(f"Unable to get start id for start minute {start_minute} : {self.by_minute[start_minute]}")
-		if end_id is None:
 			log.warning(f"Unable to get end id for end minute {end_minute} : {self.by_minute[end_minute]}")
+			return [], None, None
 		missing_ids = []
 		count_ignored_ids = 0
 		for int_id in range(start_id, end_id + 1):
diff --git a/personal/combine/merge_and_backfill.py b/personal/combine/merge_and_backfill.py
index 07386d6..78df2c4 100644
--- a/personal/combine/merge_and_backfill.py
+++ b/personal/combine/merge_and_backfill.py
@@ -189,6 +189,10 @@ def build_day(day_to_process, input_folders, output_folder, object_type, reddit,
 			else:
 				working_highest_minute = minute_iterator - timedelta(minutes=1)
 			missing_ids, start_id, end_id = objects.get_missing_ids_by_minutes(working_lowest_minute, working_highest_minute, ignore_ids)
+			if start_id is None or end_id is None:
+				log.warning(f"Unable to get start or end id for minute {minute_iterator} : {working_lowest_minute} : {working_highest_minute}")
+				minute_iterator += timedelta(minutes=1)
+				continue
 			log.debug(
 				f"{file_type}: Backfilling from: {working_lowest_minute.strftime('%y-%m-%d_%H-%M')} ({utils.base36encode(start_id)}|{start_id}) to "
 				f"{working_highest_minute.strftime('%y-%m-%d_%H-%M')} ({utils.base36encode(end_id)}|{end_id}) with {len(missing_ids)} ({end_id - start_id}) ids")