From 8163eac969a895511a55f6fdd7554b4ad90bcfe7 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Tue, 7 Sep 2021 16:28:14 +0200
Subject: TakeTwo: Check for empty observed vector list

---
 libcrystfel/src/indexers/taketwo.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'libcrystfel/src')

diff --git a/libcrystfel/src/indexers/taketwo.c b/libcrystfel/src/indexers/taketwo.c
index 78921a9f..0b652b9f 100644
--- a/libcrystfel/src/indexers/taketwo.c
+++ b/libcrystfel/src/indexers/taketwo.c
@@ -1831,6 +1831,11 @@ static int gen_observed_vecs(struct rvec *rlps, int rlp_count,
 		}
 	}
 
+	if ( count == 0 ) {
+		ERROR("No observed vectors for cell!\n");
+		return 0;
+	}
+
 	/* Sort such that the shortest distances are searched first. */
 	qsort(cell->obs_vecs, count, sizeof(struct SpotVec), compare_spot_vecs);
 
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