fix issue #262
fix issue #262

shaominghaoo/emqttd,yocome/emqttd,fsxchen/emqttd,gxbllm/emqttd,yangchaogit/emqttd,santuoshi/emqttd,AcmHacker/emqttd,neviim/emqttd,guidao/emqttd,jfjalburquerque/emqttd,janshahid/jmq,joaohf/emqttd,fengshao0907/emqttd,codertrack/emqttd