1 files changed, 17 insertions, 0 deletions
diff --git a/old-ui/app/send.js b/old-ui/app/send.js
index 9ab064aea..0dc0fa778 100644
--- a/old-ui/app/send.js
+++ b/old-ui/app/send.js
@@ -247,6 +247,23 @@ SendTransactionScreen.prototype.onSubmit = function () {
   const recipient = state.recipient || document.querySelector('input[name="address"]').value.replace(/^[.\s]+|[.\s]+$/g, '')
   const nickname = state.nickname || ' '
   const input = document.querySelector('input[name="amount"]').value
+  const parts = input.split('')
+
+  let message
+
+  if (isNaN(input) || input === '') {
+    message = 'Invalid ether value.'
+    return this.props.dispatch(actions.displayWarning(message))
+  }
+
+  if (parts[1]) {
+    var decimal = parts[1]
+    if (decimal.length > 18) {
+      message = 'Ether amount is too precise.'
+      return this.props.dispatch(actions.displayWarning(message))
+    }
+  }
+
   const value = util.normalizeEthStringToWei(input)
   const txData = document.querySelector('input[name="txData"]').value
   const balance = this.props.balance