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-rw-r--r--libcrystfel/src/stream.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/stream.c b/libcrystfel/src/stream.c
index 808be152..e7062e25 100644
--- a/libcrystfel/src/stream.c
+++ b/libcrystfel/src/stream.c
@@ -1043,6 +1043,8 @@ void write_geometry_file(Stream *st, const char *geom_filename) {
FILE *geom_fh;
char *rval;
+ if ( geom_filename == NULL ) return;
+
geom_fh = fopen(geom_filename, "r");
if ( geom_fh == NULL ) {
ERROR("Failed to read detector geometry from "