From 87a90f04ce9db14d7f097955468e9e4f2d2f06f3 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Mon, 31 Aug 2015 12:09:24 +0200
Subject: Trap attempt to merge zero crystals

---
 src/merge.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/merge.c')

diff --git a/src/merge.c b/src/merge.c
index 97d7762c..9ff64b57 100644
--- a/src/merge.c
+++ b/src/merge.c
@@ -205,6 +205,11 @@ RefList *merge_intensities(Crystal **crystals, int n, int n_threads,
 	Reflection *refl;
 	RefListIterator *iter;
 
+	if ( n == 0 ) {
+		ERROR("No crystals!\n");
+		return NULL;
+	}
+
 	full = reflist_new();
 
 	qargs.full = full;
-- 
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