From 391770cd92b1f3dc2d6800fed33eaf0a44325eb8 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Sun, 14 Dec 2014 16:55:14 +0100
Subject: Detect invalid event

---
 libcrystfel/src/events.c | 2 ++
 src/dw-hdfsee.c          | 5 +++++
 2 files changed, 7 insertions(+)

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;
 	}
diff --git a/src/dw-hdfsee.c b/src/dw-hdfsee.c
index 78f691b6..72e3b435 100644
--- a/src/dw-hdfsee.c
+++ b/src/dw-hdfsee.c
@@ -2546,6 +2546,11 @@ DisplayWindow *displaywindow_open(char *filename, char *geom_filename,
 			if ( event != NULL ) {
 				ev = get_event_from_event_string(event);
 				dw->curr_event = find_event(ev, dw->ev_list);
+				if ( dw->curr_event == dw->ev_list->num_events)
+				{
+					ERROR("Invalid event\n");
+					return NULL;
+				}
 			} else {
 				dw->curr_event = 0;
 				ev = dw->ev_list->events[dw->curr_event];
-- 
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