diff --git a/internal/jsre/deps/web3.js b/internal/jsre/deps/web3.js
index 0aa738a2af..43386c5ef1 100644
--- a/internal/jsre/deps/web3.js
+++ b/internal/jsre/deps/web3.js
@@ -2266,8 +2266,11 @@ var isAddress = function (address) {
  * @return {Boolean}
 */
 var isChecksumAddress = function (address) {
+    if (typeof address === 'undefined') return false;
+
     // Check each case
     address = address.replace('0x','');
+    if (address.length !== 40) return false;
     var addressHash = sha3(address.toLowerCase());
 
     for (var i = 0; i < 40; i++ ) {