From fdeae6bdf694a4c6ee510d94d3ae0728c635f413 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Mon, 18 Apr 2016 18:42:58 +0100
Subject: [PATCH] Display web3 encoding error (if arguments are not supplied by
 the user, etc.)

---
 assets/js/universal-dapp.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/assets/js/universal-dapp.js b/assets/js/universal-dapp.js
index a7b74a0238..25be51d43d 100644
--- a/assets/js/universal-dapp.js
+++ b/assets/js/universal-dapp.js
@@ -287,8 +287,14 @@ UniversalDApp.prototype.getCallButton = function(args) {
             return;
         }
         var data = '';
-        if (!isConstructor || funArgs.length > 0)
-            data = args.encode(funArgs);
+        if (!isConstructor || funArgs.length > 0) {
+            try {
+                data = args.encode(funArgs);
+            } catch(e) {
+                replaceOutput($result, $('<span/>').text('Error encoding arguments: ' + e));
+                return;
+            }
+        }
         if (data.slice(0, 9) == 'undefined')
             data = data.slice(9);
         if (data.slice(0, 2) == '0x') data = data.slice(2);