diff --git a/src/Query/Query.php b/src/Query/Query.php
index 9a7d0c4..de4698f 100644
--- a/src/Query/Query.php
+++ b/src/Query/Query.php
@@ -423,7 +423,11 @@ private static function filterDataWithMatchedIndex(
 			foreach ($matched_index->fields as $matched_field) {
 				if ($keys === vec[]) {
 					foreach ($candidates[$matched_field] as $candidate_value) {
-						$keys[] = vec[$candidate_value as arraykey];
+						if (!$candidate_value is arraykey) {
+							continue;
+						}
+
+						$keys[] = vec[$candidate_value];
 					}
 				} else {
 					$new_keys = vec[];