These errors repeatedly appear on the command line interface (ie. "chat window") usually rather late in the game.
[f=0053145] Error: LuaRules::RunCallIn: error = 2, RecvFromSynced, [string "LuaRules/Gadgets/lups_nano_spray.lua"]:301: attempt to compare number with nil
[f=0053148] Error: LuaRules::RunCallIn: error = 2, GameFrame, [string "LuaRules/Gadgets/unit_shield_link.lua"]:153: attempt to perform arithmetic on field 'x' (a nil value)
Communication is very difficult due to the messages and framerate seems to drop significantly.