From 992427f0e0975a14f2145f3dd3e768e16a6782d9 Mon Sep 17 00:00:00 2001
From: catbref <misc-github@talk2dom.com>
Date: Thu, 10 Dec 2020 11:31:37 +0000
Subject: [PATCH] Fix NPE due to unboxing null/no entry from
 PREVIOUS_STATES.get() in TradeBotWebSocket. Usually triggered when creating
 new trade-bot entry while having open websocket connection.

---
 src/main/java/org/qortal/api/websocket/TradeBotWebSocket.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/qortal/api/websocket/TradeBotWebSocket.java b/src/main/java/org/qortal/api/websocket/TradeBotWebSocket.java
index 7ec852f9..4a8bd348 100644
--- a/src/main/java/org/qortal/api/websocket/TradeBotWebSocket.java
+++ b/src/main/java/org/qortal/api/websocket/TradeBotWebSocket.java
@@ -59,7 +59,8 @@ public class TradeBotWebSocket extends ApiWebSocket implements Listener {
 		String tradePrivateKey58 = Base58.encode(tradeBotData.getTradePrivateKey());
 
 		synchronized (PREVIOUS_STATES) {
-			if (PREVIOUS_STATES.get(tradePrivateKey58) == tradeBotData.getStateValue())
+			Integer previousStateValue = PREVIOUS_STATES.get(tradePrivateKey58);
+			if (previousStateValue != null && previousStateValue == tradeBotData.getStateValue())
 				// Not changed
 				return;