diff --git a/selflocalization/selflocalize.py b/selflocalization/selflocalize.py
index 72db8a8..b4e7850 100644
--- a/selflocalization/selflocalize.py
+++ b/selflocalization/selflocalize.py
@@ -224,11 +224,11 @@ try:
 
         # Fetch next frame
         colour = cam.get_next_frame()
+        landmark_values = []
 
         # Detect objects
         objectIDs, dists, angles = cam.detect_aruco_objects(colour)
         if not isinstance(objectIDs, type(None)):
-            landmark_values = []
 
             # List detected objects
             for i in range(len(objectIDs)):