3 months ago - MrFreake_PDX - Direct link
This sounds like a mod conflict.

Can you disable your mods and see if the issue persists? If it does, you will likely need to verify your game files:
Right click Stellaris, Properties, Local files and click Verify Game files. If that doesn't resolve your issue, opening a ticket at support.paradoxplaza.com is your best bet.

Hope this helps!