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avoid invalid memory address or nil pointer dereference
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@ -260,7 +260,7 @@ func (v *Volume) collectStatus() (maxFileKey types.NeedleId, datFileSize int64,
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defer v.dataFileAccessLock.RUnlock()
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glog.V(3).Infof("collectStatus volume %d", v.Id)
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if v.nm == nil {
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if v.nm == nil || v.DataBackend == nil {
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return
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}
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