capture computrer crashed - file system compressed and corrupt

Hi!
I captured a linux computer (debian 12, ext4).
Unfortunately the power failed during the capture process.
At the beginning of the process the disk was compressed, then the capture started, then the power failed. Now the filesystem has not been uncompressed.
Is there anything I can do ?
(I use FOG since v0.9something and this problem NEVER occured)
Thanks!
Xibeaga