hotfix

minibot_vision/scripts/SignDetector.py

@@ -122,7 +122,8 @@ def detect_sign(img_rgb_stream, image_timestamp):
 
     # publish patch for capture images
     if enable_capture_images:
-        publish_img_patch(patches[0])
+        if len(patches) >= 1:
+            publish_img_patch(patches[0])
 
     # cut to multiple images at keypoints
     text = []