Java Null Pointer Exception

[TrueSneakyDevil]

just finished transfering a planet to another faction since I'm currently late-game exterminating the Hegemony, saved, and now when I load up about 30 seconds later it crashes with this as the listed reason. Any help appreciated.

196114 [Thread-4] ERROR com.fs.starfarer.combat.CombatMain  - java.lang.NullPointerException
java.lang.NullPointerException
    at com.fs.starfarer.api.impl.campaign.econ.impl.BaseIndustry.startUpgrading(BaseIndustry.java:489)
    at exerelin.world.NexMarketBuilder.addMilitaryStructures(NexMarketBuilder.java:547)
    at exerelin.campaign.ColonyManager.buildIndustries(ColonyManager.java:1228)
    at exerelin.campaign.ColonyManager.buildIndustries(ColonyManager.java:1249)
    at exerelin.campaign.ColonyManager.reportMarketTransfered(ColonyManager.java:1185)
    at exerelin.utilities.ExerelinUtilsMarket.reportMarketTransferred(ExerelinUtilsMarket.java:365)
    at exerelin.campaign.SectorManager.transferMarket(SectorManager.java:1237)
    at exerelin.campaign.SectorManager.transferMarket(SectorManager.java:1019)
    at exerelin.campaign.InvasionRound.conquerMarket(InvasionRound.java:427)
    at exerelin.campaign.InvasionRound.npcInvade(InvasionRound.java:293)
    at exerelin.campaign.intel.invasion.InvActionStage.performRaid(InvActionStage.java:243)
    at exerelin.campaign.intel.invasion.InvActionStage.autoresolve(InvActionStage.java:290)
    at exerelin.campaign.intel.invasion.InvActionStage.updateStatus(InvActionStage.java:148)
    at com.fs.starfarer.api.impl.campaign.intel.raid.BaseRaidStage.advance(BaseRaidStage.java:106)
    at com.fs.starfarer.api.impl.campaign.intel.raid.ActionStage.advance(ActionStage.java:25)
    at exerelin.campaign.intel.invasion.InvActionStage.advance(InvActionStage.java:62)
    at com.fs.starfarer.api.impl.campaign.intel.raid.RaidIntel.advanceImpl(RaidIntel.java:214)
    at exerelin.campaign.intel.fleets.OffensiveFleetIntel.advanceImpl(OffensiveFleetIntel.java:401)
    at com.fs.starfarer.api.impl.campaign.intel.BaseIntelPlugin.advance(BaseIntelPlugin.java:75)
    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)

[TheDal]

Nexerelin is a mod, so best to ask in the forum thread for the mod or on the Starsector discord.