Be more defensive when checking user balance

resources/js/bots/wallet/bot.js

@@ -321,7 +321,20 @@ function validateSend(params, context) {
         };
     }
 
-    var balance = web3.eth.getBalance(context.from);
+    try {
+        var balance = web3.eth.getBalance(context.from);
+        if (isNaN(balance)) {
+            throw new Error();
+        }
+    } catch (err) {
+        return {
+            markup: status.components.validationMessage(
+                I18n.t('validation_internal_title'),
+                I18n.t('validation_balance')
+            )
+        };
+    }
+    
     var fee = calculateFee(
         params["bot-db"]["sliderValue"],
         {

resources/js/bots/wallet/translations.js

@@ -22,6 +22,8 @@ I18n.translations = {
         request_requesting: 'Requesting ',
         request_requesting_from: 'from ',
 
+        validation_internal_title: 'Internal error',
+        validation_balance: 'Could not fetch current balance',
         validation_title: 'Amount',
         validation_tx_title: 'Transaction',
         validation_tx_failed: 'Transaction failed',