How to debug correctly?

hi there,
on my first project i encounterd an error in one scene,
the game crashes directly if i click any button in the scene.
all other scenes work fine…

i tried to use “preview and debug” but when the game starts, there are no problems, and if i click and the game crashes, the debugger only report that there is no preview running…

i tried to deactive all events, so that no button shoud do anything, but it crashes also…
there are no missing images or something else in the scene…

how can i find the problem?

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Having the same problem: just commenting so I can see responses if there are any!