diff --git a/js/models/core/PublicKeyRing.js b/js/models/core/PublicKeyRing.js
index 14ae83add..76edc40e1 100644
--- a/js/models/core/PublicKeyRing.js
+++ b/js/models/core/PublicKeyRing.js
@@ -157,6 +157,10 @@ PublicKeyRing.prototype.addCopayer = function(newEpk, nickname) {
       throw new Error('PKR already has that key');
   });
 
+  if (!newEpk) {
+    newEpk = this._newExtendedPublicKey();
+  }
+
   var i = this.copayersHK.length;
   var bip = new HK(newEpk);
   this.copayersHK.push(bip);