From 5820e42b8d6eb0aa4d3c98f2b51b1548043ed5c3 Mon Sep 17 00:00:00 2001
From: CraftBukkit/Spigot <noreply+git-craftbukkit@papermc.io>
Date: Tue, 16 Dec 2014 10:53:29 +0000
Subject: [PATCH] SPIGOT-210: Remove the exception when dropping a non-existant
 task

If the server crashes during chunk generation then the chunk would have never
been added to the executor, this caused a second exception to be thrown when
the server shutdown from the first exception

By: Thinkofdeath <thinkofdeath@spigotmc.org>
---
 .../java/org/bukkit/craftbukkit/util/AsynchronousExecutor.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/util/AsynchronousExecutor.java b/paper-server/src/main/java/org/bukkit/craftbukkit/util/AsynchronousExecutor.java
index 81bb0d15a1..193c3621c6 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/util/AsynchronousExecutor.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/util/AsynchronousExecutor.java
@@ -263,7 +263,7 @@ public final class AsynchronousExecutor<P, T, C, E extends Throwable> {
     public boolean drop(P parameter, C callback) throws IllegalStateException {
         final Task task = tasks.get(parameter);
         if (task == null) {
-            throw new IllegalStateException("Unknown " + parameter);
+            return true;
         }
         if (!task.callbacks.remove(callback)) {
             throw new IllegalStateException("Unknown " + callback + " for " + parameter);