diff --git a/pg_wait_sampling.c b/pg_wait_sampling.c
index f5bd6e0..2640668 100644
--- a/pg_wait_sampling.c
+++ b/pg_wait_sampling.c
@@ -808,8 +808,26 @@ pg_wait_sampling_reset_profile(PG_FUNCTION_ARGS)
{
LOCKTAG collectorTag;
+ /*
+ * This also guards against the case when the
+ * extension was not loaded at all, but this
+ * function was called. pgws_collector_hdr is
+ * NULL in this case.
+ */
check_shmem();
+ /* The collector may have not started yet (it'd be a
+ * race condition with background worker startup to
+ * use latch without a check here).
+ * Or worse, registration of the worker might have been
+ * denied, if there are too many workers already.
+ * This is why we cannot wait for its start with a while
+ * loop.
+ */
+ if (!pgws_collector_hdr->latch)
+ ereport(ERROR, (errcode(ERRCODE_INTERNAL_ERROR),
+ errmsg("pg_wait_sampling collector wasn't started")));
+
pgws_init_lock_tag(&queueTag, PGWS_QUEUE_LOCK);
LockAcquire(&queueTag, ExclusiveLock, false, false);
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