when reaching the mission where she sends you to destroy the Missile, after the missile explode and you leave the battle, there is a crash :
Fatal: null
Check starsector.log for more info
this is last message in starsector.log

191107 [Thread-3] ERROR com.fs.starfarer.combat.CombatMain - java.util.ConcurrentModificationException
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
at java.util.HashMap$KeyIterator.next(Unknown Source)
at shipmastery.combat.FlagshipTracker.onCombatEnd(FlagshipTracker.java:89)
at shipmastery.campaign.StateTracker.setState(StateTracker.java:15)
at shipmastery.campaign.Initializer.advance(Initializer.java:25)
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.super(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)