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-rw-r--r--core/dive.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/core/dive.c b/core/dive.c
index 3c2c2afde..945c13426 100644
--- a/core/dive.c
+++ b/core/dive.c
@@ -893,7 +893,7 @@ int explicit_first_cylinder(struct dive *dive, struct divecomputer *dc)
{
if (dc) {
struct event *ev = get_next_event(dc->events, "gaschange");
- if (ev && dc->sample && ev->time.seconds == dc->sample[0].time.seconds)
+ if (ev && ((dc->sample && ev->time.seconds == dc->sample[0].time.seconds) || ev->time.seconds <= 1))
return get_cylinder_index(dive, ev);
else if (dc->divemode == CCR)
return MAX(get_cylinder_idx_by_use(dive, DILUENT), 0);