Someone triggered the error, I dont know what exactly happened. Here is the server log.

9280.151 Error MainLoop.cpp:1432: Exception at tick 4944749: The mod Enemy Race Manager (2.0.13) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event enemyracemanager::on_gui_click (ID 1)
LuaPlayer doesn't contain key zoom_to_world.
stack traceback:
[C]: in function 'index'
__enemyracemanager/gui/deployer_attachment.lua:91: in function 'go_to'
enemyracemanager/gui/events.lua:221: in function 'event_action'
enemyracemanager/gui/events.lua:300: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>
9280.151 Error ServerMultiplayerManager.cpp:84: MultiplayerManager failed: "The mod Enemy Race Manager (2.0.13) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event enemyracemanager::on_gui_click (ID 1)
LuaPlayer doesn't contain key zoom_to_world.
stack traceback:
[C]: in function 'index'
__enemyracemanager/gui/deployer_attachment.lua:91: in function 'go_to'
enemyracemanager/gui/events.lua:221: in function 'event_action'
enemyracemanager/gui/events.lua:300: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>"
9280.151 Info ServerMultiplayerManager.cpp:806: updateTick(4944749) changing state from(InGame) to(Failed)
9280.167 Quitting: multiplayer error.

Thanks for the report. 2.0.16 should fix it.

I think is the same error but just in case i will show the log.

The mod Enemy Race Manager (2.0.18) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event enemyracemanager::on_gui_selected_tab_changed (ID 160)
enemyracemanager/gui/army_tabs/unit_control.lua:53: attempt to perform arithmetic on local 'auto_deploy_units' (a nil value)
stack traceback:
enemyracemanager/gui/army_tabs/unit_control.lua:53: in function '?'
enemyracemanager/gui/army_control_window.lua:119: in function 'update'
enemyracemanager/gui/events.lua:431: in function '?'
enemyracemanager/gui/events.lua:439: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>