Very often I'm getting the following error (see the stacktrace) when running the benchmark. It could happen even on a small number of users (30-50 users).
TypeError: Cannot call method 'packet' of null
at Socket.packet (/my/dir/node_modules/socket.io-client/lib/socket.js:290:22)
at SocketNamespace.packet (/my/dir/node_modules/socket.io-client/lib/namespace.js:64:17)
at SocketNamespace.emit (/my/dir/node_modules/socket.io-client/lib/namespace.js:113:17)