From a79c5ddfa4c8a3a876a94a6922cff2f377ac7731 Mon Sep 17 00:00:00 2001
From: fred <fred>
Date: Tue, 26 Mar 2002 23:10:03 +0000
Subject: [PATCH] lilypond-1.3.39

---
 lily/side-position-interface.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lily/side-position-interface.cc b/lily/side-position-interface.cc
index c76b0a09b8..2d29cf9e33 100644
--- a/lily/side-position-interface.cc
+++ b/lily/side-position-interface.cc
@@ -129,7 +129,13 @@ Side_position_interface::aligned_on_self (Dimension_cache const *c)
     {
       Direction d = to_dir (align);
       Interval ext(elm->extent (ax));
-      if (d)
+
+      if (ext.empty_b ())
+	{
+	  programming_error ("I'm empty. Can't align on self");
+	  return 0.0;
+	}
+      else if (d)
 	{
 	  return - ext[d];
 	}
-- 
2.39.5