From 02e8e8974049f1965df3f7b0b9b874a46a26c150 Mon Sep 17 00:00:00 2001
From: Danny Ryan <dannyjryan@gmail.com>
Date: Mon, 4 Mar 2019 19:05:00 -0700
Subject: [PATCH] handle get_base_reward when no previous balance

---
 specs/core/0_beacon-chain.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 0e836df1f..13eae0432 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -2171,6 +2171,9 @@ First, we define some additional helpers:
 
 ```python
 def get_base_reward(state: BeaconState, index: ValidatorIndex) -> Gwei:
+    if get_previous_total_balance(state) == 0:
+        return 0
+
     adjusted_quotient = integer_squareroot(get_previous_total_balance(state)) // BASE_REWARD_QUOTIENT
     return get_effective_balance(state, index) // adjusted_quotient // 5
 ```