Fix server crash with piercing shots through vanished players (#2390)

Spigot-Server-Patches/0131-Add-ProjectileCollideEvent.patch

@@ -8,7 +8,7 @@ diff --git a/src/main/java/net/minecraft/server/EntityArrow.java b/src/main/java
 index 2b829abac..af0f5cb00 100644
 --- a/src/main/java/net/minecraft/server/EntityArrow.java
 +++ b/src/main/java/net/minecraft/server/EntityArrow.java
-@@ -184,6 +184,16 @@ public abstract class EntityArrow extends Entity implements IProjectile {
+@@ -184,6 +184,17 @@ public abstract class EntityArrow extends Entity implements IProjectile {
                      }
                  }
  
@@ -18,6 +18,7 @@ index 2b829abac..af0f5cb00 100644
 +                    com.destroystokyo.paper.event.entity.ProjectileCollideEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callProjectileCollideEvent(this, (MovingObjectPositionEntity)object);
 +                    if (event.isCancelled()) {
 +                        object = null;
++                        movingobjectpositionentity = null;
 +                    }
 +                }
 +                // Paper end