Just reporting this bug I found.

It had been described here, happened in my game in a different situation.

I went to the mission at the Maelstrom with Dr. Ridley, where I need to fend off the Stilettos while she works. On my way there, I was being chased and hit hard by enemies. Keeping track of shields and hull was confusing because it looked like the stats weren't displaying properly, which I thought was because of the EMP cloud from that region. When the mission triggered and started, I was already in a fight, which I think might have continued. At some point, shortly before or after triggering the mission, I noted I had no hull reading at all, but kept fighting. The mission ended, I won unexpectedly because I was hit with no shields several times. When I got back to a station, my hull was reading negative 2 billion and I couldn't repair it, button was greyed out.

I saved the game, loaded again. This time it read minus one hull (screen attached). I left the station and picked a fight with hostiles (screen attached), hull reading was still empty, but I was no longer invencible, I lost.

With minus one hull the game apparently can go on as usual, I could repair my hull with MO nanobots and also at the station.

Damn we fixed it so many times, and when we add something new, that old bug sometimes reappear. Thanks for letting us know, we'll take a look into it.