From 6209f03ade2b1fd0cbcba216db90c51bc263cae1 Mon Sep 17 00:00:00 2001
From: YouROK <8yourok8@mail.ru>
Date: Wed, 30 Jun 2021 22:08:59 +0300
Subject: [PATCH] fix crash in some times

---
 server/torr/storage/torrstor/cache.go | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/server/torr/storage/torrstor/cache.go b/server/torr/storage/torrstor/cache.go
index a480ca8..58ab981 100644
--- a/server/torr/storage/torrstor/cache.go
+++ b/server/torr/storage/torrstor/cache.go
@@ -121,11 +121,13 @@ func (c *Cache) AdjustRA(readahead int64) {
 	if settings.BTsets.CacheSize == 0 {
 		c.capacity = readahead * 3
 	}
-	c.muReaders.Lock()
-	for r, _ := range c.readers {
-		r.SetReadahead(readahead)
+	if len(c.readers) > 0 {
+		c.muReaders.Lock()
+		for r, _ := range c.readers {
+			r.SetReadahead(readahead)
+		}
+		c.muReaders.Unlock()
 	}
-	c.muReaders.Unlock()
 }
 
 func (c *Cache) GetState() *state.CacheState {