From 6f55de63b6aa64481db0e294844f39a1ca7fffee Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Mon, 7 Nov 2022 20:39:04 +0100
Subject: check_hkl: Make --wilson more robust against invalid data

---
 src/check_hkl.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/check_hkl.c b/src/check_hkl.c
index aa972a7f..d01303d4 100644
--- a/src/check_hkl.c
+++ b/src/check_hkl.c
@@ -359,17 +359,25 @@ static void wilson_plot(RefList *list, UnitCell *cell, const SymOpList *sym,
 			double *s2fit;
 			double *lnifit;
 			int nbfit = 0;
+			int ndisc = 0;
 			s2fit = malloc(nbins*sizeof(double));
 			lnifit = malloc(nbins*sizeof(double));
 			if ( (s2fit==NULL) || (lnifit==NULL) ) return;
 			for ( i=0; i<nbins-bs; i++ ) {
-				if ( isnan(plot_i[bs+i]) ) continue;
-				s2fit[i] = s2[bs+i];
-				lnifit[i] = plot_i[bs+i];
+				if ( isnan(plot_i[bs+i]) ) {
+					ndisc++;
+					continue;
+				}
+				s2fit[nbfit] = s2[bs+i];
+				lnifit[nbfit] = plot_i[bs+i];
 				nbfit++;
 			}
+			if ( ndisc > 0 ) {
+				ERROR("%i bins contained invalid values "
+				"and were ignored.\n", ndisc);
+			}
 			if ( nbfit < 3 ) {
-				ERROR("Too many bits had invalid values.\n");
+				ERROR("Not enough bins left.\n");
 				return;
 			}
 			gsl_fit_linear(s2fit, 1, lnifit, 1, nbfit,
-- 
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