diff --git a/.travis.yml b/.travis.yml
index 2c63eff..98d4318 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
dist: jammy
language: c
env:
-- PG_MAJOR=18 SNAPSHOT=1
+- PG_MAJOR=18 BETA=1
- PG_MAJOR=17
- PG_MAJOR=16
- PG_MAJOR=15
diff --git a/pg_wait_sampling.c b/pg_wait_sampling.c
index a0cc582..e165a6a 100644
--- a/pg_wait_sampling.c
+++ b/pg_wait_sampling.c
@@ -369,7 +369,7 @@ _PG_init(void)
1,
INT_MAX,
PGC_SIGHUP,
- GUC_UNIT_MS,
+ 0,
NULL,
NULL,
NULL);
@@ -382,7 +382,7 @@ _PG_init(void)
1,
INT_MAX,
PGC_SIGHUP,
- GUC_UNIT_MS,
+ 0,
NULL,
NULL,
NULL);
@@ -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);
diff --git a/run-tests.sh b/run-tests.sh
index f3f1bba..f42e999 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -6,6 +6,7 @@ export PGDATA=/var/lib/postgresql/$PG_MAJOR/test
export COPT=-Werror
export USE_PGXS=1
+sudo mkdir -p /var/lib/postgresql/$PG_MAJOR
sudo chmod 1777 /var/lib/postgresql/$PG_MAJOR
sudo chmod 1777 /var/run/postgresql
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