diff --git a/ocv_corner_tracker.py b/ocv_corner_tracker.py
index 9b030b5..33ea789 100644
--- a/ocv_corner_tracker.py
+++ b/ocv_corner_tracker.py
@@ -295,8 +295,9 @@ if __name__ == '__main__':
 				i = 0
 				for ct in tracker_list:
 					mean_distance = ct.process(image, image_anno)
-					cv2.putText(image_anno, f"Distance [{i}] : ({mean_distance[0]:+05.2f}, {mean_distance[1]:+05.2f})",
-							(20, 25 + 25 * i), cv2.FONT_HERSHEY_SIMPLEX, 0.5, ct.color, 1)
+					if mean_distance is not None:
+						cv2.putText(image_anno, f"Distance [{i}] : ({mean_distance[0]:+05.2f}, {mean_distance[1]:+05.2f})",
+								(20, 25 + 25 * i), cv2.FONT_HERSHEY_SIMPLEX, 0.5, ct.color, 1)
 					i += 1
 				cv2.imshow(f"Image Anno", image_anno)
 			else: