diff --git a/validator/client/validator_metrics.go b/validator/client/validator_metrics.go
index 5670487b9..09ddadc8e 100644
--- a/validator/client/validator_metrics.go
+++ b/validator/client/validator_metrics.go
@@ -75,9 +75,9 @@ func (v *validator) LogValidatorGainsAndLosses(ctx context.Context, slot uint64)
 		if slot < params.BeaconConfig().SlotsPerEpoch {
 			v.prevBalance[bytesutil.ToBytes48(pkey)] = params.BeaconConfig().MaxEffectiveBalance
 		}
-		newBalance := float64(resp.BalancesAfterEpochTransition[i]) / float64(params.BeaconConfig().GweiPerEth)
 
-		if v.prevBalance[bytesutil.ToBytes48(pkey)] > 0 {
+		if v.prevBalance[bytesutil.ToBytes48(pkey)] > 0 && len(resp.BalancesAfterEpochTransition) > i {
+			newBalance := float64(resp.BalancesAfterEpochTransition[i]) / float64(params.BeaconConfig().GweiPerEth)
 			prevBalance := float64(resp.BalancesBeforeEpochTransition[i]) / float64(params.BeaconConfig().GweiPerEth)
 			percentNet := (newBalance - prevBalance) / prevBalance
 			log.WithFields(logrus.Fields{