I've gotten two variants of the crash with slightly more text, seems like it might be an issue with Exotica Technologies?
Spoiler
264481 [Thread-3] ERROR com.fs.starfarer.combat.CombatMain - java.util.ConcurrentModificationException
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:911)
at java.util.ArrayList$Itr.next(ArrayList.java:861)
at com.fs.starfarer.api.combat.listeners.CombatListenerUtil.reportFleetMemberDeplo yed(CombatListenerUtil.java:183)
at com.fs.starfarer.combat.CombatEngine.reportFleetMemberDeployed(Unknown Source)
at com.fs.starfarer.combat.CombatFleetManager.Ò00000(Unknown Source)
at com.fs.starfarer.combat.CombatFleetManager.deploy(Unknown Source)
at com.fs.starfarer.combat.CombatFleetManager.spawnFleetMember(Unknown Source)
at org.lazywizard.lazylib.combat.CombatUtils.spawnShipOrWingDirectly(CombatUtils.java:389)
at activators.drones.DroneActivator.spawnDrone(DroneActivator.kt:118)
at exoticatechnologies.modifications.exotics.impl.TerminatorSubsystems$TerminatorDroneActivator.spawnDrone(TerminatorSubsystems.kt:131)
at activators.drones.DroneActivator.advanceInternal(DroneActivator.kt:172)
at activators.ActivatorManager.advanceActivators(ActivatorManager.kt:47)
at activators.ActivatorCombatPlugin.advance(ActivatorCombatPlugin.kt:9)
at com.fs.starfarer.title.Object.for$Oo.o00000(Unknown Source)
at com.fs.starfarer.combat.super.new.super(Unknown Source)
at com.fs.starfarer.combat.CombatEngine.advanceInner(Unknown Source)
at com.fs.starfarer.combat.CombatEngine.advance(Unknown Source)
at com.fs.starfarer.combat.CombatState.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.o00000(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:750)
Spoiler
118393 [Thread-3] ERROR com.fs.starfarer.combat.CombatMain - java.util.ConcurrentModificationException
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:911)
at java.util.ArrayList$Itr.next(ArrayList.java:861)
at com.fs.starfarer.api.combat.listeners.CombatListenerUtil.reportFleetMemberDeplo yed(CombatListenerUtil.java:183)
at com.fs.starfarer.combat.CombatEngine.reportFleetMemberDeployed(Unknown Source)
at com.fs.starfarer.combat.CombatFleetManager.Ò00000(Unknown Source)
at com.fs.starfarer.combat.CombatFleetManager.deploy(Unknown Source)
at com.fs.starfarer.combat.CombatFleetManager.spawnFleetMember(Unknown Source)
at org.lazywizard.lazylib.combat.CombatUtils.spawnShipOrWingDirectly(CombatUtils.java:389)
at activators.drones.DroneActivator.spawnDrone(DroneActivator.kt:118)
at activators.drones.DroneActivator.advanceInternal(DroneActivator.kt:172)
at activators.ActivatorManager.advanceActivators(ActivatorManager.kt:47)
at activators.ActivatorCombatPlugin.advance(ActivatorCombatPlugin.kt:9)
at com.fs.starfarer.title.Object.for$Oo.o00000(Unknown Source)
at com.fs.starfarer.combat.super.new.super(Unknown Source)
at com.fs.starfarer.combat.CombatEngine.advanceInner(Unknown Source)
at com.fs.starfarer.combat.CombatEngine.advance(Unknown Source)
at com.fs.starfarer.combat.CombatState.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.o00000(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:750)