Handle exception when calculate last modification time.
Handle exception when calculate last modification time.

cloudcopy/seahub,Chilledheart/seahub,cloudcopy/seahub,madflow/seahub,madflow/seahub,Chilledheart/seahub,madflow/seahub,miurahr/seahub,madflow/seahub,cloudcopy/seahub,Chilledheart/seahub,madflow/seahub,miurahr/seahub,miurahr/seahub,Chilledheart/seahub,cloudcopy/seahub,Chilledheart/seahub,miurahr/seahub