From b9b7da905ef9ef51d3e060ab1612becd63ab272d Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Sun, 12 Apr 2020 01:00:12 -0700
Subject: [PATCH] handle nil chunk cache

---
 weed/util/chunk_cache/chunk_cache.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/weed/util/chunk_cache/chunk_cache.go b/weed/util/chunk_cache/chunk_cache.go
index 682f5185a..ead7a8d0b 100644
--- a/weed/util/chunk_cache/chunk_cache.go
+++ b/weed/util/chunk_cache/chunk_cache.go
@@ -47,6 +47,10 @@ func NewChunkCache(maxEntries int64, dir string, diskSizeMB int64, segmentCount
 }
 
 func (c *ChunkCache) GetChunk(fileId string) (data []byte) {
+	if c == nil {
+		return
+	}
+
 	c.RLock()
 	defer c.RUnlock()
 
@@ -76,6 +80,9 @@ func (c *ChunkCache) GetChunk(fileId string) (data []byte) {
 }
 
 func (c *ChunkCache) SetChunk(fileId string, data []byte) {
+	if c == nil {
+		return
+	}
 	c.Lock()
 	defer c.Unlock()
 
@@ -107,6 +114,9 @@ func (c *ChunkCache) SetChunk(fileId string, data []byte) {
 }
 
 func (c *ChunkCache) Shutdown() {
+	if c == nil {
+		return
+	}
 	c.Lock()
 	defer c.Unlock()
 	for _, diskCache := range c.diskCaches {