diff --git a/ext/mixed/js/dictionary-data-util.js b/ext/mixed/js/dictionary-data-util.js
index 65ad51a1..72c28172 100644
--- a/ext/mixed/js/dictionary-data-util.js
+++ b/ext/mixed/js/dictionary-data-util.js
@@ -17,6 +17,11 @@
 
 class DictionaryDataUtil {
     static getPitchAccentInfos(definition) {
+        if (typeof definition.character === 'string') {
+            // Kanji
+            return [];
+        }
+
         const results = new Map();
         const allExpressions = new Set();
         const allReadings = new Set();