From 6563d65f5efd836c7152c0ab75ea9a3afa995879 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Thu, 6 Mar 2014 21:33:44 +0100
Subject: Fix segfault

---
 src/ambigator.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/ambigator.c b/src/ambigator.c
index 5f7f921b..028ed4bb 100644
--- a/src/ambigator.c
+++ b/src/ambigator.c
@@ -467,7 +467,7 @@ static void detwin(struct cc_list *ccs, int n_crystals, int *assignments,
 		f /= p;
 		g /= q;
 
-		fprintf(fh, "%5.3f %5.3f\n", f, g);
+		if ( fh != NULL ) fprintf(fh, "%5.3f %5.3f\n", f, g);
 
 		mf += f;
 		nmf++;
-- 
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