From ee083bde159d83a51f7e562d3a88ad78c8a77617 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Wed, 27 Sep 2017 11:27:20 +0200
Subject: Add an assertion

---
 libcrystfel/src/index.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'libcrystfel/src/index.c')

diff --git a/libcrystfel/src/index.c b/libcrystfel/src/index.c
index a9b504fe..e4e3fc6a 100644
--- a/libcrystfel/src/index.c
+++ b/libcrystfel/src/index.c
@@ -517,6 +517,7 @@ static int try_indexer(struct image *image, IndexingMethod indm,
 {
 	int i, r;
 	int n_bad = 0;
+	int n_before = image->n_crystals;
 
 	switch ( indm & INDEXING_METHOD_MASK ) {
 
@@ -557,6 +558,9 @@ static int try_indexer(struct image *image, IndexingMethod indm,
 
 	}
 
+	/* Stop a really difficult to debug situation in its tracks */
+	assert(image->n_crystals - n_before == r);
+
 	/* For all the crystals found this time ... */
 	for ( i=0; i<r; i++ ) {
 
-- 
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