From 0b9a8d7f3df27245cab97c9b210e9ce6384928b3 Mon Sep 17 00:00:00 2001
From: Tomas Musil <tomik.musil@gmail.com>
Date: Mon, 21 Jul 2014 23:51:46 +0200
Subject: [PATCH] catch geometric errors

---
 src/manual.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/manual.py b/src/manual.py
index b761f5e..2eb4ac5 100644
--- a/src/manual.py
+++ b/src/manual.py
@@ -91,7 +91,10 @@ def find_lines(im_orig):
                 if len(corners) == 4:
                     im = im_orig.copy()
                     draw = ImageDraw.Draw(im)
-                    l_vert, l_hor = lines(corners)
+                    try:
+                        l_vert, l_hor = lines(corners)
+                    except Exception:
+                        corners = corners[:-1]
                     for l in l_vert:
                         draw.line(l, fill=color, width=line_width)
                     for l in l_hor:
-- 
2.4.2