From a4e565e3a7dce51bef8bdbfd7af91e65cef35fe6 Mon Sep 17 00:00:00 2001
From: terence tsao <terence@prysmaticlabs.com>
Date: Thu, 29 Nov 2018 20:34:21 -0800
Subject: [PATCH] Return Unused Error in State_transition  (#1007)

* add todo for 712

* return unused err
---
 beacon-chain/core/state/state_transition.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/beacon-chain/core/state/state_transition.go b/beacon-chain/core/state/state_transition.go
index bbd59dc4d4..e9ab5a22ec 100644
--- a/beacon-chain/core/state/state_transition.go
+++ b/beacon-chain/core/state/state_transition.go
@@ -120,6 +120,10 @@ func crossLinkCalculations(
 			st.LastStateRecalculationSlot(),
 			attestation.GetSlot(),
 		)
+		if err != nil {
+			return nil, err
+		}
+
 		indices, err := v.AttesterIndices(shardCommittees, attestation)
 		if err != nil {
 			return nil, err