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-rw-r--r--src/hrs-scaling.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/hrs-scaling.c b/src/hrs-scaling.c
index fcf7efae..5c5ec8f0 100644
--- a/src/hrs-scaling.c
+++ b/src/hrs-scaling.c
@@ -263,6 +263,10 @@ static double iterate_scale(struct image *images, int n,
e_val = gsl_vector_alloc(n);
e_vec = gsl_matrix_alloc(n, n);
val = gsl_eigen_symmv(M, e_val, e_vec, work);
+ if ( val ) {
+ ERROR("Couldn't diagonalise matrix.\n");
+ return 0.0;
+ }
gsl_eigen_symmv_free(work);
val = gsl_eigen_symmv_sort(e_val, e_vec, GSL_EIGEN_SORT_ABS_DESC);