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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 491f7811..c194d369 100644
--- a/libcrystfel/src/events.c
+++ b/libcrystfel/src/events.c
@@ -336,6 +336,8 @@ struct event *get_event_from_event_string(const char *ev_string)
char *sep;
char *start;
+ if ( ev_string == NULL ) return NULL;
+
ev_sep = strstr(ev_string, "//");
if ( ev_sep == NULL ) return NULL;