Github user ustcweizhou commented on the pull request: https://github.com/apache/cloudstack/pull/830#issuecomment-162520618 @sureshanaparti I do not get NPE when listVolumes. please notice the code: long instanceId = volume.getVmId(); if (instanceId > 0 && volume.getState() != Volume.State.Destroy) { ... if the volume is not attached, this judgment returns false.
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