handle hex

libs/remix-lib/src/execution/txRunner.ts

@@ -118,7 +118,17 @@ export class TxRunner {
     this.executionContext.vm().stateManager.getAccount(Address.fromString(from)).then((res) => {
       // See https://github.com/ethereumjs/ethereumjs-tx/blob/master/docs/classes/transaction.md#constructor
       // for initialization fields and their types
-      value = value ? new BN(value, 10) : 0
+      if (!value) value = 0
+      if (typeof value === 'string') {
+        if (value.startsWith('0x')) value =  new BN(value.replace('0x', ''), 'hex')  
+        else {
+          try {
+            value = new BN(value, 10)
+          } catch (e) {
+            return callback('Unable to parse the value ' + e.message)
+          }
+        }  
+      }
       const tx = Transaction.fromTxData({
         nonce: new BN(res.nonce),
         gasPrice: '0x1',