diff --git a/core/modules/layout_builder/src/InlineBlockUsage.php b/core/modules/layout_builder/src/InlineBlockUsage.php
index ab94d4c535bb8f46cc12ae1e9a24382ab45159cb..75da54e19125cf4c96c47dc99c9f6a052508588a 100644
--- a/core/modules/layout_builder/src/InlineBlockUsage.php
+++ b/core/modules/layout_builder/src/InlineBlockUsage.php
@@ -31,6 +31,9 @@ public function __construct(Connection $database) {
    * {@inheritdoc}
    */
   public function addUsage($block_content_id, EntityInterface $entity) {
+    if (!is_int($block_content_id)) {
+      return;
+    }
     $this->database->merge('inline_block_usage')
       ->keys([
         'block_content_id' => $block_content_id,