Prevent executing commands if server stopped

Author: Dreeam-qwq

leaf-server/minecraft-patches/features/0300-Prevent-executing-commands-if-server-stopped.patch

@@ -0,0 +1,33 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Dreeam <[email protected]>
+Date: Mon, 29 Sep 2025 03:28:55 -0400
+Subject: [PATCH] Prevent executing commands if server stopped
+
+The server is executing player's commands when server stopped, but the player didn't disconnect.
+Since the server is stopped, the commands execute on current thread instead of the main thread.
+
+It's a kind of weird race condition, not sure what causes it,
+so just add a `isStopped` check, like the check under `handleChat`
+
+diff --git a/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index 581791bf2892715543f003c36e301e690cc393f1..0d7a00a7865dd79a2aaec6b1060e763e5815f12a 100644
+--- a/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -2369,7 +2369,7 @@ public class ServerGamePacketListenerImpl
+         final boolean isAfkCommandCooldown = this.performAfkCooldown(packet.command()); // Leaf - Improve Purpur AFK system
+         this.tryHandleChat(packet.command(), () -> {
+             // CraftBukkit start - SPIGOT-7346: Prevent disconnected players from executing commands
+-            if (this.player.hasDisconnected()) {
++            if (this.player.hasDisconnected() || this.server.isStopped()) { // Leaf - Prevent executing commands if server stopped
+                 return;
+             }
+             // CraftBukkit end
+@@ -2411,7 +2411,7 @@ public class ServerGamePacketListenerImpl
+             final boolean isAfkCommandCooldown = this.performAfkCooldown(packet.command()); // Leaf - Improve Purpur AFK system
+             this.tryHandleChat(packet.command(), () -> {
+                 // CraftBukkit start - SPIGOT-7346: Prevent disconnected players from executing commands
+-                if (this.player.hasDisconnected()) {
++                if (this.player.hasDisconnected() || this.server.isStopped()) { // Leaf - Prevent executing commands if server stopped
+                     return;
+                 }
+                 // CraftBukkit end