diff --git a/build/extract.js b/build/extract.js
index ee2c964..ec2612d 100644
--- a/build/extract.js
+++ b/build/extract.js
@@ -15,10 +15,11 @@ module.exports = async function(callback) {
   // start from first block, block 0 is genesis, it doesn't contain any transaction
   for (var i = 1; i <= await web3.eth.getBlockNumber(); i++) {
     var block = await web3.eth.getBlock(i)
-    for (var idx = 0; idx < block.transactions.length; idx++)
-    var transaction = await web3.eth.getTransaction(block.transactions[idx])
-    console.log("from: " + transaction.from + " to:" + transaction.to + " Nonce:" + transaction.nonce)
-    var tx_json = JSON.stringify(transaction) + "\n"
-    fs.appendFileSync(logFile, tx_json);
+    for (var idx = 0; idx < block.transactions.length; idx++) {
+      var transaction = await web3.eth.getTransaction(block.transactions[idx])
+      console.log("from: " + transaction.from + " to:" + transaction.to + " Nonce:" + transaction.nonce)
+      var tx_json = JSON.stringify(transaction) + "\n"
+      fs.appendFileSync(logFile, tx_json);
+    }
   }
 }