diff --git a/Classes/Service/LinkingSuggestionsService.php b/Classes/Service/LinkingSuggestionsService.php
index 126aef15..20b9b980 100644
--- a/Classes/Service/LinkingSuggestionsService.php
+++ b/Classes/Service/LinkingSuggestionsService.php
@@ -254,6 +254,9 @@ protected function groupWordsByRecord(array $candidateWords): array
         $candidateWordsByRecords = [];
         foreach ($candidateWords as $candidateWord) {
             $recordKey = $candidateWord['uid_foreign'] . '-' . $candidateWord['tablenames'];
+            if (!array_key_exists('weight', $candidateWord) || !array_key_exists('df', $candidateWord)) {
+                continue;
+            }
             $candidateWordsByRecords[$recordKey][$candidateWord['stem']] = [
                 'weight' => (int)$candidateWord['weight'],
                 'df' => (int)$candidateWord['df']