Nothing special, tried exporting an ordinary plan after updating.

The mod Factory Planner - exportable to fake factorissimo (1.1.7) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factoryplanner-is-exportable-to-fake-factorissimo::on_gui_click (ID 1)
Expected sprite button or sprite.
stack traceback:
[C]: in function 'index'
...planner-is-exportable-to-fake-factorissimo/control.lua:189: in function <...planner-is-exportable-to-fake-factorissimo__/control.lua:119>

please provide a screenshot of how the gui looked at the time of pressing the button

Sure, here: https://imgur.com/a/orpNq87

hmm indeed unexpected that such a simple factory is suddenly able to crash with that specific error, unfortunately its late now so it'll be fixed tomorrow, leaving your save in the linked discord or my dms there will be appreciated

fixed in 1.1.8