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The scenario level caused a non-recoverable error.
Please report this error to the scenario author.

Error while running event level::on_gui_click (ID 1)
bool expected, got string
stack traceback:
[C]: in function '__newindex'
__level__/wave_defense.lua in function 'toggle_upgrade_frame'
__level__/wave_defense.lua in function '?'
__level__/wave_defense.lua in function 'handler'
__core__/lualib/event_handler.lua:47: in function <__core__/lualib/event_handler.lua:45>

Thanks for the report, this has been fixed for the next release.