diff --git a/handlers/multistage-diagram-tactile-svg/tactile_svg.py b/handlers/multistage-diagram-tactile-svg/tactile_svg.py
index 82b5f94b3..37eb84ad9 100644
--- a/handlers/multistage-diagram-tactile-svg/tactile_svg.py
+++ b/handlers/multistage-diagram-tactile-svg/tactile_svg.py
@@ -308,6 +308,11 @@ def cohenSutherlandClip(src, tgt, lims):
         if code1 == 0 and code2 == 0:
             break
 
+        # If neither endpoint lies within rectangle
+        elif code1 > 0 and code2 > 0:
+            logging.debug("cohenSutherlandClip: no endpoint in rectangle!")
+            break
+
         # Some segment lies within the rectangle
         else: