diff --git a/app/assets/javascripts/discourse/app/initializers/deprecation-this-property-fallback-handler.js b/app/assets/javascripts/discourse/app/initializers/deprecation-this-property-fallback-handler.js
index a431af71966..24f2bc6dfc4 100644
--- a/app/assets/javascripts/discourse/app/initializers/deprecation-this-property-fallback-handler.js
+++ b/app/assets/javascripts/discourse/app/initializers/deprecation-this-property-fallback-handler.js
@@ -23,7 +23,7 @@ export default {
       if (pluginMatch || themeIdMatch) {
         const source = {
           type: pluginMatch ? "plugin" : "theme",
-          name: pluginMatch || getThemeInfo(parseInt(themeIdMatch, 10)),
+          name: pluginMatch || getThemeInfo(parseInt(themeIdMatch, 10)).name,
           id: themeIdMatch,
         };
         options.source = source;