Fixes #20969

Author: Mads Nielsen

app/code/Magento/CatalogSearch/Model/Adapter/Mysql/Aggregation/DataProvider/SelectBuilderForAttribute.php

@@ -101,7 +101,7 @@ public function build(Select $select, AbstractAttribute $attribute, int $current
             $subSelect = $select;
             $subSelect->from(['main_table' => $table], ['main_table.entity_id', 'main_table.value'])
                 ->distinct()
-                ->where('main_table.attribute_id = ?', $attribute->getAttributeId())
+                ->where('main_table.attribute_id = ?', (int) $attribute->getAttributeId())
                 ->where('main_table.store_id = ? ', $currentScopeId);
             if ($this->isAddStockFilter()) {
                 $subSelect = $this->applyStockConditionToSelect->execute($subSelect);