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-rw-r--r--libcrystfel/src/utils.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/utils.c b/libcrystfel/src/utils.c
index 643e0158..4a1d6c60 100644
--- a/libcrystfel/src/utils.c
+++ b/libcrystfel/src/utils.c
@@ -223,7 +223,7 @@ gsl_vector *solve_svd(gsl_vector *v, gsl_matrix *M, int *n_filt, int verbose)
/* "SAS" is now "U" */
/* Filter the eigenvalues */
- *n_filt = check_eigen(s_val, verbose);
+ if ( n_filt != NULL ) *n_filt = check_eigen(s_val, verbose);
gsl_matrix_free(SAS_copy);