diff --git a/ext/bg/js/settings/dictionary-import-controller.js b/ext/bg/js/settings/dictionary-import-controller.js
index 4a1a7e26..a603fb82 100644
--- a/ext/bg/js/settings/dictionary-import-controller.js
+++ b/ext/bg/js/settings/dictionary-import-controller.js
@@ -242,7 +242,9 @@ class DictionaryImportController {
     }
 
     _setSpinnerVisible(visible) {
-        this._spinner.hidden = !visible;
+        if (this._spinner !== null) {
+            this._spinner.hidden = !visible;
+        }
     }
 
     _preventPageExit() {