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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 76f1344b..23067c56 100644
--- a/libcrystfel/src/stream.c
+++ b/libcrystfel/src/stream.c
@@ -1442,6 +1442,8 @@ static char *make_key(const char *filename,
{
char *key;
+ if ( ev == NULL ) ev = "//";
+
key = malloc(strlen(filename)+strlen(ev)+2);
if ( key == NULL ) return NULL;