diff --git a/pg_wait_sampling.c b/pg_wait_sampling.c
index f5bd6e0..e165a6a 100644
--- a/pg_wait_sampling.c
+++ b/pg_wait_sampling.c
@@ -649,6 +649,10 @@ receive_array(SHMRequest request, Size item_size, Size *count)
pgws_collector_hdr->request = request;
LockRelease(&collectorTag, ExclusiveLock, false);
+ /*
+ * Check that the collector was started to avoid NULL
+ * pointer dereference.
+ */
if (!pgws_collector_hdr->latch)
ereport(ERROR, (errcode(ERRCODE_INTERNAL_ERROR),
errmsg("pg_wait_sampling collector wasn't started")));
@@ -819,6 +823,14 @@ pg_wait_sampling_reset_profile(PG_FUNCTION_ARGS)
pgws_collector_hdr->request = PROFILE_RESET;
LockRelease(&collectorTag, ExclusiveLock, false);
+ /*
+ * Check that the collector was started to avoid NULL
+ * pointer dereference.
+ */
+ if (!pgws_collector_hdr->latch)
+ ereport(ERROR, (errcode(ERRCODE_INTERNAL_ERROR),
+ errmsg("pg_wait_sampling collector wasn't started")));
+
SetLatch(pgws_collector_hdr->latch);
LockRelease(&queueTag, ExclusiveLock, false);
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