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-rw-r--r--libcrystfel/src/events.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/events.c b/libcrystfel/src/events.c
index d40d2021..b008eee6 100644
--- a/libcrystfel/src/events.c
+++ b/libcrystfel/src/events.c
@@ -239,6 +239,8 @@ int find_event(struct event *ev, struct event_list *el)
{
int i;
+ if ( ev == NULL ) return el->num_events;
+
for ( i=0; i<el->num_events; i++ ) {
if ( events_equal(ev, el->events[i]) ) return i;
}