From 074cf281c975dbc253a68d8daa5de67926b624a7 Mon Sep 17 00:00:00 2001
From: Jesse Boyd <jessepaleg@gmail.com>
Date: Sat, 21 Jul 2018 15:25:27 +1000
Subject: [PATCH] Check session exists before saving

---
 .../com/sk89q/worldedit/session/SessionManager.java   | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/core/src/main/java/com/sk89q/worldedit/session/SessionManager.java b/core/src/main/java/com/sk89q/worldedit/session/SessionManager.java
index 0e33b75c..7dc3aae5 100644
--- a/core/src/main/java/com/sk89q/worldedit/session/SessionManager.java
+++ b/core/src/main/java/com/sk89q/worldedit/session/SessionManager.java
@@ -275,15 +275,20 @@ public class SessionManager {
      */
     public synchronized void remove(SessionOwner owner) {
         checkNotNull(owner);
-        save(sessions.remove(getKey(owner)));
+        SessionHolder session = sessions.remove(getKey(owner));
+        if (session != null) {
+            save(session);
+        }
     }
 
     public synchronized void forget(SessionOwner owner) {
         checkNotNull(owner);
         UUID key = getKey(owner);
         SessionHolder holder = sessions.remove(key);
-        softSessions.put(key, new SoftReference(holder));
-        save(holder);
+        if (holder != null) {
+            softSessions.put(key, new SoftReference(holder));
+            save(holder);
+        }
     }
 
     /**