ambigator: Avoid NULL dereference if unit cell is not found in stream

1 files changed, 7 insertions, 3 deletions

diff --git a/src/ambigator.c b/src/ambigator.c
index a922cacc..c55148b3 100644
--- a/src/ambigator.c
+++ b/src/ambigator.c
@@ -115,9 +115,13 @@ static struct flist *asymm_and_merge(RefList *in, const SymOpList *sym,
 
 		get_indices(refl, &h, &k, &l);
 
-		res = 2.0*resolution(cell, h, k, l);
-		if ( res < rmin ) continue;
-		if ( res > rmax ) continue;
+		if ( cell != NULL ) {
+			ERROR("Can't calculate resolution cutoff - no cell\n");
+		} else {
+			res = 2.0*resolution(cell, h, k, l);
+			if ( res < rmin ) continue;
+			if ( res > rmax ) continue;
+		}
 
 		get_asymm(sym, h, k, l, &ha, &ka, &la);