diff --git a/ext/bg/js/dictionary-importer.js b/ext/bg/js/dictionary-importer.js
index 589e7656..607a8b5e 100644
--- a/ext/bg/js/dictionary-importer.js
+++ b/ext/bg/js/dictionary-importer.js
@@ -180,7 +180,7 @@ class DictionaryImporter {
                 try {
                     await database.bulkAdd(objectStoreName, entries, i, count);
                 } catch (e) {
-                    errors.push(e);
+                    errors.push(errorToJson(e));
                 }
 
                 loadedCount += count;
diff --git a/ext/bg/js/settings/dictionaries.js b/ext/bg/js/settings/dictionaries.js
index 5e59cc3d..ed883869 100644
--- a/ext/bg/js/settings/dictionaries.js
+++ b/ext/bg/js/settings/dictionaries.js
@@ -643,9 +643,9 @@ async function onDictionaryImport(e) {
             await settingsSaveOptions();
 
             if (errors.length > 0) {
-                errors.push(...errors);
-                errors.push(`Dictionary may not have been imported properly: ${errors.length} error${errors.length === 1 ? '' : 's'} reported.`);
-                dictionaryErrorsShow(errors);
+                const errors2 = errors.map((error) => jsonToError(error));
+                errors2.push(`Dictionary may not have been imported properly: ${errors2.length} error${errors2.length === 1 ? '' : 's'} reported.`);
+                dictionaryErrorsShow(errors2);
             }
 
             onDatabaseUpdated();