diff --git a/src/controllers/PreferencesController.js b/src/controllers/PreferencesController.js
index 1a8b5b358..335dd40a2 100644
--- a/src/controllers/PreferencesController.js
+++ b/src/controllers/PreferencesController.js
@@ -839,7 +839,7 @@ class PreferencesController extends SafeEventEmitter {
         const req = this.getAddChainRequest(id)
         switch (data.status) {
           case 'approved':
-            return resolve()
+            return resolve('null') // https://docs.metamask.io/wallet/reference/wallet_addethereumchain/
           case 'rejected':
             return reject(ethErrors.provider.userRejectedRequest(`Torus add chain: ${req.errorMsg || 'User denied add chain request.'}`))
           default: