Exit status 0 after IO error

[PacAnimal]

Unplugging the power supply of an external USB drive by mistake caused the log to show this error:
stat error: Input/output error

However, cyphertite still saved the (much smaller than last run) .ct file to the server and exited with status 0, having scanned only 124M of 38.4G.

Files scanned 57204
Total data 38.4G (5.6M/sec)
Data read 124M (18.2K/sec)
Data skipped 0B
Data compressed 122M (17.9K/sec) (98%)
Data exists 124M (18.1K/sec) (0%)
Data sent 76.7K (11B/sec)
Reduction ratio 99%
Total Time 6985.448s

I would assume correct behaviour in this case would be a non-zero exit status and not uploading the incomplete .ct file.