diff --git a/frigate/api/media.py b/frigate/api/media.py
index 903cf60c0..5c4ed1b0b 100644
--- a/frigate/api/media.py
+++ b/frigate/api/media.py
@@ -195,15 +195,15 @@ async def latest_frame(
 
                 frame = request.app.camera_error_image
 
-        height = int(params.height or str(frame.shape[0]))
-        width = int(height * frame.shape[1] / frame.shape[0])
-
         if frame is None:
             return JSONResponse(
                 content={"success": False, "message": "Unable to get valid frame"},
                 status_code=500,
             )
 
+        height = int(params.height or str(frame.shape[0]))
+        width = int(height * frame.shape[1] / frame.shape[0])
+
         if height < 1 or width < 1:
             return JSONResponse(
                 content="Invalid height / width requested :: {} / {}".format(