From 762da8c491c5892880d0aea5b7798570aa7c56b4 Mon Sep 17 00:00:00 2001
From: John Tromp <john.tromp@gmail.com>
Date: Sat, 12 Jan 2019 19:41:22 +0100
Subject: [PATCH] Fix bug that crashes network with probability 2^-64 (#2358)

---
 core/src/pow/types.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/pow/types.rs b/core/src/pow/types.rs
index 6d71a321c..68b7e9867 100644
--- a/core/src/pow/types.rs
+++ b/core/src/pow/types.rs
@@ -383,7 +383,7 @@ impl Proof {
 
 	/// Difficulty achieved by this proof with given scaling factor
 	fn scaled_difficulty(&self, scale: u64) -> u64 {
-		let diff = ((scale as u128) << 64) / (self.hash().to_u64() as u128);
+		let diff = ((scale as u128) << 64) / (max(1, self.hash().to_u64()) as u128);
 		min(diff, <u64>::max_value() as u128) as u64
 	}
 }