From b119380d84fac0fd50e0215904835ed85012afc5 Mon Sep 17 00:00:00 2001
From: "Emden R. Gansner" <erg@research.att.com>
Date: Thu, 15 Aug 2013 15:01:30 -0400
Subject: [PATCH] Check for position info in graph

---
 cmd/mingle/minglemain.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmd/mingle/minglemain.c b/cmd/mingle/minglemain.c
index 90c3705e9..1e87c1c65 100644
--- a/cmd/mingle/minglemain.c
+++ b/cmd/mingle/minglemain.c
@@ -139,6 +139,10 @@ bundle (Agraph_t* g, opts_t* opts)
 		fprintf (stderr, "Error: could not convert graph %s (%s) into matrix\n", agnameof(g), fname);
 		return 1;
     }
+    if (x == NULL) {
+		fprintf (stderr, "Error: graph %s (%s) has missing \"pos\" information\n", agnameof(g), fname);
+		return 1;
+    }
 
 	A = SparseMatrix_symmetrize(A, TRUE);
 	ia = A->ia; ja = A->ja;
-- 
2.40.0