patch from https://github.com/GridPlus/gridplus-sdk/pull/367
diff --git a/node_modules/gridplus-sdk/dist/util.js b/node_modules/gridplus-sdk/dist/util.js
index 08cc920..1f58806 100644
--- a/node_modules/gridplus-sdk/dist/util.js
+++ b/node_modules/gridplus-sdk/dist/util.js
@@ -22,7 +22,7 @@ var elliptic_1 = __importDefault(require("elliptic"));
 var constants_1 = require("./constants");
 var COINS = constants_1.BIP_CONSTANTS.COINS, PURPOSES = constants_1.BIP_CONSTANTS.PURPOSES;
 var EC = elliptic_1.default.ec;
-var ec = new EC('p256');
+var ec;
 //--------------------------------------------------
 // LATTICE UTILS
 //--------------------------------------------------
@@ -219,10 +219,12 @@ var parseDER = function (sigBuf) {
 };
 exports.parseDER = parseDER;
 var getP256KeyPair = function (priv) {
+    if (ec === undefined) ec = new EC('p256');
     return ec.keyFromPrivate(priv, 'hex');
 };
 exports.getP256KeyPair = getP256KeyPair;
 var getP256KeyPairFromPub = function (pub) {
+    if (ec === undefined) ec = new EC('p256');
     return ec.keyFromPublic(pub, 'hex');
 };
 exports.getP256KeyPairFromPub = getP256KeyPairFromPub;