diff --git a/docs/images/image10.png b/docs/images/image10.png
index bb59c80..67fa229 100644
Binary files a/docs/images/image10.png and b/docs/images/image10.png differ
diff --git a/docs/images/image11.png b/docs/images/image11.png
index 42859ad..92ebdfd 100644
Binary files a/docs/images/image11.png and b/docs/images/image11.png differ
diff --git a/examples/align_filter_viewer.py b/examples/align_filter_viewer.py
index d77f510..b99df24 100644
--- a/examples/align_filter_viewer.py
+++ b/examples/align_filter_viewer.py
@@ -82,6 +82,10 @@ def main(argv):
             frames = pipeline.wait_for_frames(100)
             if not frames:
                 continue
+            color_frame = frames.get_color_frame()
+            depth_frame = frames.get_depth_frame()
+            if not color_frame or not depth_frame:
+                continue
             frames = align_filter.process(frames)
             color_frame = frames.get_color_frame()
             depth_frame = frames.get_depth_frame()