diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php
@@ -53,7 +53,7 @@
     PhabricatorCursorPagedPolicyAwareQuery $query,
     $value) {
 
-    if (strlen($value)) {
+    if (phutil_nonempty_string($value)) {
       $query->withApplicationSearchContainsConstraint(
         $this->newNumericIndex(null),
         $value);