diff --git a/frigate/video/detect.py b/frigate/video/detect.py
index a2877f83c0..591b57f97e 100644
--- a/frigate/video/detect.py
+++ b/frigate/video/detect.py
@@ -338,7 +338,12 @@ def process_frames(
             continue
 
         if datetime.now().astimezone(UTC) > next_region_update:
-            region_grid = requestor.send_data(REQUEST_REGION_GRID, camera_config.name)
+            updated_grid = requestor.send_data(REQUEST_REGION_GRID, camera_config.name)
+
+            # A failed request replies empty, so keep the current grid
+            if updated_grid:
+                region_grid = updated_grid
+
             next_region_update = get_tomorrow_at_time(2)
 
         try: