diff --git a/src/elements/db/BlockQuery.php b/src/elements/db/BlockQuery.php
index 77dc82dc..1a286a2a 100644
--- a/src/elements/db/BlockQuery.php
+++ b/src/elements/db/BlockQuery.php
@@ -380,7 +380,7 @@ protected function beforePrepare(): bool
 
             if (
                 $fieldIdForStructure === null &&
-                (is_int($this->id) || is_array($this->id) && count($this->id) === 1)
+                (is_numeric($this->id) || is_array($this->id) && count($this->id) === 1)
             ) {
                 $fieldIdForStructure = (new Query())
                     ->select(['fieldId'])