From 8a62f3f456633a42c53c0191ead6aac2d3944af0 Mon Sep 17 00:00:00 2001
From: Paul Hauner <paul@paulhauner.com>
Date: Wed, 11 Dec 2019 11:02:54 +1100
Subject: [PATCH] Hopefully fix NaN issue in sync speed (#701)

---
 beacon_node/client/src/notifier.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/beacon_node/client/src/notifier.rs b/beacon_node/client/src/notifier.rs
index 27739b796c..cd23f9b47b 100644
--- a/beacon_node/client/src/notifier.rs
+++ b/beacon_node/client/src/notifier.rs
@@ -297,7 +297,7 @@ impl Speedo {
         let (prev_slot, _) = self.0.last()?;
         let slots_per_second = self.slots_per_second()?;
 
-        if target_slot > *prev_slot {
+        if target_slot > *prev_slot && slots_per_second > 0.0 {
             let distance = (target_slot - *prev_slot).as_u64() as f64;
             Some(distance / slots_per_second)
         } else {