From 72862147f3220e12ba5ebf1ad64ddddd3ff163b1 Mon Sep 17 00:00:00 2001
From: Danilo Pantani <danpantani@gmail.com>
Date: Mon, 22 Feb 2021 13:44:36 -0300
Subject: [PATCH] fix possible runtime error

---
 batchbuilder/batchbuilder.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/batchbuilder/batchbuilder.go b/batchbuilder/batchbuilder.go
index ed57501..4a25da7 100644
--- a/batchbuilder/batchbuilder.go
+++ b/batchbuilder/batchbuilder.go
@@ -64,7 +64,10 @@ func (bb *BatchBuilder) BuildBatch(coordIdxs []common.Idx, configBatch *ConfigBa
 	tp := txprocessor.NewTxProcessor(bbStateDB, configBatch.TxProcessorConfig)
 
 	ptOut, err := tp.ProcessTxs(coordIdxs, l1usertxs, l1coordinatortxs, pooll2txs)
-	return ptOut.ZKInputs, tracerr.Wrap(err)
+	if err != nil {
+		return nil, tracerr.Wrap(err)
+	}
+	return ptOut.ZKInputs, nil
 }
 
 // LocalStateDB returns the underlying LocalStateDB