From e9f09948b53d274c2735a4c1cb1a173f4594949c Mon Sep 17 00:00:00 2001
From: Han-Wen Nienhuys <hanwen@xs4all.nl>
Date: Mon, 5 Feb 2007 19:53:14 +0100
Subject: [PATCH] robustness: don't barf if control-points is in-progress.

---
 lily/tuplet-number.cc | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/lily/tuplet-number.cc b/lily/tuplet-number.cc
index aa0c343c58..54032803e9 100644
--- a/lily/tuplet-number.cc
+++ b/lily/tuplet-number.cc
@@ -52,9 +52,15 @@ Tuplet_number::print (SCM smob)
 
   SCM cpoints =  tuplet->get_property ("control-points");
   Drul_array<Offset> points;
-  points[LEFT] = ly_scm2offset (scm_car (cpoints));
-  points[RIGHT] = ly_scm2offset (scm_cadr (cpoints));
-
+  if (scm_is_pair (cpoints))
+    {
+      points[LEFT] = ly_scm2offset (scm_car (cpoints));
+      points[RIGHT] = ly_scm2offset (scm_cadr (cpoints));
+    }
+  else
+    {
+      programming_error ("wrong type for control-points");
+    }
   stc->translate ((points[RIGHT] + points[LEFT]) / 2);
   
   return stc_scm;
-- 
2.39.5