Ntopng v.3.2.180110 problem with network discovery

[grandrivers]

Jan 11 11:31:53 ntopng [NetworkDiscovery.cpp:256] ERROR: Send error [55/No buffer space available]
Jan 11 11:31:50 ntopng [NetworkDiscovery.cpp:256] ERROR: Send error [55/No buffer space available]
Jan 11 11:30:15 kernel pppoe0: can't handle af31
Jan 11 11:30:15 kernel pppoe0: can't handle af31
Jan 11 11:30:15 kernel pppoe0: can't handle af31
Jan 11 11:30:15 kernel pppoe0: can't handle af31

[grandrivers]

I just disable network discovery on my external interfaces and will see if this fixes the problem

[grandrivers]

yes turning off network discover on pppoe connection fixed issue