Various users have been reporting Crashing in the game when clicking on the star map, which i have narrowed down given some clues from Draconequus, that its occurring on EXISTING saves which were working in the previous update without issue. but NEW saved games in Whatta-blast with v1.4.2 are unaffected.

What seems to have happened is that without proper modding support from Klei, Baator was missing a valid description for the subworlds within each asteroid prior to v1.4.2, this was not a problem in the past versions of Oni, but this is now a problem in Whatta-blast update, and unfortunately although the problem is fixed for new worlds created in Whatta-blast with v1.4.2. existing worlds in Whatta-blast with v1.4.2 are still going to crash. you will see an error like the following:
NullReferenceException: Object reference not set to an instance of an object

This I cannot resolve unfortunately. But not all hope is lost.

Workaround 1) there is a workaround that will be last for a long as Klei support the previous major update by reverted back to the older version. you can do this will the following steps:

1. go to your game library and right click on Oxygen Not Included and select Properties
2. In the pop-up Dialog box, select Betas from the left side menu. where it says None, select Public_previous_update, from the 8th March. see image:

https://imgur.com/a/c9nMjty

3. wait for steam to downgrade to the earlier release.
4. load up Oxygen Not Included, and accept the warning about playing an old release. see notes here:
https://forums.kleientertainment.com/forums/topic/140474-previous-update-steam-branch-access/
5. Load your world and check the star map works. see image:

https://imgur.com/a/FhT6rNo

Note: this method will only work for a long as the older version is available, that might only be another 4-6 months, further older versions are not kept. Which is a shame Klei don't support this.

Workaround 2) Another workaround is to open the star map from another asteroid other than Baator, which seems to work however clicking on the Baator Asteroid can then also crash the game.