FujiFilm 90 - Manual (Page 38)

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◆ Do not open the camera back while there is a film in mid-roll in the camera.
☞ If the camera back is opened while there is a film in mid-roll in the camera, the film may be exposed to the light.
☞ The exposure counter is reset to “ ”.
If the camera back is opened by mistake:
1 Close the camera back without removing the film.
2 The remaining frames can be used.
∗
Since the exposure counter is reset to “ ” when the camera back is opened, the correct film count is not displayed. However, you can continue to
make exposures until the roll is finished at which time you will feel a resistance in the film transport. At this point, rewind the film into the cassette
and remove it from the camera. DO NOT TRY TO ADVANCE THE FILM ONCE THIS RESISTANCE IS FELT.