diff --git a/eth/filters/filter_system.go b/eth/filters/filter_system.go
index c28fe787b6..02a8238ffb 100644
--- a/eth/filters/filter_system.go
+++ b/eth/filters/filter_system.go
@@ -265,7 +265,7 @@ func NewEventSystem(sys *FilterSystem) *EventSystem {
 	m.stateSyncSub = m.backend.SubscribeStateSyncEvent(m.stateSyncCh)
 
 	// Make sure none of the subscriptions are empty
-	if m.txsSub == nil || m.logsSub == nil || m.rmLogsSub == nil || m.chainSub == nil {
+	if m.txsSub == nil || m.logsSub == nil || m.rmLogsSub == nil || m.chainSub == nil || m.pendingLogsSub == nil {
 		log.Crit("Subscribe for event system failed")
 	}
 
@@ -458,6 +458,7 @@ func (es *EventSystem) eventLoop() {
 	defer func() {
 		es.txsSub.Unsubscribe()
 		es.logsSub.Unsubscribe()
+		es.pendingLogsSub.Unsubscribe()
 		es.rmLogsSub.Unsubscribe()
 		es.chainSub.Unsubscribe()
 		es.stateSyncSub.Unsubscribe()
diff --git a/internal/cli/snapshot_test.go b/internal/cli/snapshot_test.go
index 115f0b0599..51c1e30503 100644
--- a/internal/cli/snapshot_test.go
+++ b/internal/cli/snapshot_test.go
@@ -46,6 +46,7 @@ var (
 )
 
 func TestOfflineBlockPrune(t *testing.T) {
+	t.Skip("PBSS does not support ancient block pruning")
 	t.Parallel()
 
 	// Corner case for 0 remain in ancinetStore.