diff --git a/modules/search_api_db/src/Plugin/search_api/backend/Database.php b/src/Plugin/search_api/backend/Database.php
--- a/modules/search_api_db/src/Plugin/search_api/backend/Database.php
+++ b/modules/search_api_db/src/Plugin/search_api/backend/Database.php
@@ -1362,6 +1362,7 @@
               // Take care that the score doesn't exceed the maximum value for
               // the database column (2^32-1).
               $score = min((int) $score, 4294967295);
+              $score = max((int) $score, 0);
               $text_inserts[] = [
                 'item_id' => $item_id,
                 'field_name' => $field_name,