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-rw-r--r--libcrystfel/src/integer_matrix.c5
-rw-r--r--libcrystfel/src/rational.c5
2 files changed, 10 insertions, 0 deletions
diff --git a/libcrystfel/src/integer_matrix.c b/libcrystfel/src/integer_matrix.c
index 1d1c3a47..9431d189 100644
--- a/libcrystfel/src/integer_matrix.c
+++ b/libcrystfel/src/integer_matrix.c
@@ -406,6 +406,11 @@ void intmat_print(const IntegerMatrix *m)
{
unsigned int i, j;
+ if ( m == NULL ) {
+ fprintf(stderr, "(NULL matrix)\n");
+ return;
+ }
+
for ( i=0; i<m->rows; i++ ) {
fprintf(stderr, "[ ");
diff --git a/libcrystfel/src/rational.c b/libcrystfel/src/rational.c
index 88a485ff..fe87c034 100644
--- a/libcrystfel/src/rational.c
+++ b/libcrystfel/src/rational.c
@@ -510,6 +510,11 @@ void rtnl_mtx_print(const RationalMatrix *m)
{
unsigned int i, j;
+ if ( m == NULL ) {
+ fprintf(stderr, "(NULL matrix)\n");
+ return;
+ }
+
for ( i=0; i<m->rows; i++ ) {
fprintf(stderr, "[ ");