From 2ba377ff801394c099bdaa669a8f4a09264162fc Mon Sep 17 00:00:00 2001
From: Andronik <write@reusable.software>
Date: Thu, 13 Jan 2022 09:15:59 +0100
Subject: [PATCH] runtime-api: do not cache None SessionInfo (#4706)

* approval-voting: add more logs

* approval-voting: query finalized block on startup and increase look back

* runtime-api: do not cache None SessionInfo
---
 node/core/runtime-api/src/cache.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/node/core/runtime-api/src/cache.rs b/node/core/runtime-api/src/cache.rs
index 72206da8a114..d2582a26adb7 100644
--- a/node/core/runtime-api/src/cache.rs
+++ b/node/core/runtime-api/src/cache.rs
@@ -317,7 +317,10 @@ impl RequestResultCache {
 	}
 
 	pub(crate) fn cache_session_info(&mut self, key: SessionIndex, value: Option<SessionInfo>) {
-		self.session_info.insert(key, ResidentSizeOf(value));
+		// only cache Some(SessionInfo)
+		if value.is_some() {
+			self.session_info.insert(key, ResidentSizeOf(value));
+		}
 	}
 
 	pub(crate) fn dmq_contents(