Safeguarding variable value.

Author: evertonfraga

interface/components/TxHistory/TxRow.js

@@ -12,7 +12,7 @@ class TxRow extends Component {
   valueToEtherAmount = value => {
     const theValue = web3.utils.isHex(value)
       ? new BigNumber(web3.utils.hexToNumberString(value))
-      : new BigNumber(value);
+      : new BigNumber(value || 0);
     const etherAmount = theValue
       .dividedBy(new BigNumber('1000000000000000000'))
       .toFixed();