diff --git a/src/infrastructure/cluster/PhabricatorDatabaseRef.php b/src/infrastructure/cluster/PhabricatorDatabaseRef.php
--- a/src/infrastructure/cluster/PhabricatorDatabaseRef.php
+++ b/src/infrastructure/cluster/PhabricatorDatabaseRef.php
@@ -393,7 +393,7 @@
 
         if ($is_replica) {
           $latency = idx($replica_status, 'Seconds_Behind_Master');
-          if (!strlen($latency)) {
+          if (!phutil_nonempty_string($latency)) {
             $ref->setReplicaStatus(self::REPLICATION_NOT_REPLICATING);
           } else {
             $latency = (int)$latency;