diff --git a/app/pages/Multisig/index.js b/app/pages/Multisig/index.js
index 5a732879e..bdf973dd2 100644
--- a/app/pages/Multisig/index.js
+++ b/app/pages/Multisig/index.js
@@ -237,6 +237,11 @@ class KeyInputRow extends Component {
       return;
     }
 
+    if (walletKeys.includes(accountKey)) {
+      this.props.showError(t('multisigAccountKeyExists'));
+      return;
+    }
+
     try {
       // N - 1 (for us) - num(other added keys as of now)
       const remainingKeys = (walletN - 1 - walletKeys.length);
diff --git a/locales/en.json b/locales/en.json
index 816ee220f..6b0614c01 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -220,6 +220,7 @@
   "me": "me",
   "miscellaneous": "Miscellaneous",
   "multisigAccountKey": "Account Key (xpub)",
+  "multisigAccountKeyExists": "This account key has already been added.",
   "multisigAccountKeyInvalid": "Invalid account key.",
   "multisigActions": "Actions",
   "multisigLoadTx": "Load Transaction",