From 85ab8f227a0c07ea72d259a29d169fb0956c873a Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Fri, 4 Sep 2020 14:36:25 +0200
Subject: make_key: Handle NULL event

---
 libcrystfel/src/stream.c | 2 ++
 1 file changed, 2 insertions(+)

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;
 
-- 
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