Had Nexerelin and other mods enabled, travelling to a Black Hole system with at least one planet in the system (A Frozen Planet, which the target was orbiting)
At least half or one second after I get in and start moving to the frozen planet, this error occurs
Spoiler
7916852 [Thread-4] ERROR com.fs.starfarer.combat.CombatMain - java.lang.NullPointerException
java.lang.NullPointerException
at src.lt.data.scripts.campaign.Lt_SpecialCampaignFleetAI.run(Lt_SpecialCampaignFleetAI.java:43)
at com.fs.starfarer.campaign.ai.AssignmentModule.advance(Unknown Source)
at com.fs.starfarer.campaign.ai.ModularFleetAI.advance(Unknown Source)
at com.fs.starfarer.campaign.fleet.CampaignFleet.advance(Unknown Source)
at com.fs.starfarer.campaign.BaseLocation.advance(Unknown Source)
at com.fs.starfarer.campaign.StarSystem.advance(Unknown Source)
at com.fs.starfarer.campaign.CampaignEngine.advance(Unknown Source)
at com.fs.starfarer.campaign.CampaignState.advance(Unknown Source)
at com.fs.starfarer.BaseGameState.traverse(Unknown Source)
at com.fs.state.AppDriver.begin(Unknown Source)
at com.fs.starfarer.combat.CombatMain.main(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Which must mean it may or may not have a Scyan (?) ship in the fleet with modular parts.
Honestly, I dunno, but that error occured. The Lt_SpecialCampaignAI part caught my eye.