From 2ab695f308533d737086be39a171cfc6d59d8450 Mon Sep 17 00:00:00 2001
From: catbref <misc-github@talk2dom.com>
Date: Wed, 6 May 2020 11:58:02 +0100
Subject: [PATCH] NTP: don't call shutdownNow() on null instanceExecutor

When using fixed NTP offset, e.g. via "testNtpoffset" in settings.json,
Controller calls NTP.shutdownNow() which throws a NPE because
NTP.instanceExecutor is null.
---
 src/main/java/org/qortal/utils/NTP.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/qortal/utils/NTP.java b/src/main/java/org/qortal/utils/NTP.java
index cc6dec56..b141ed96 100644
--- a/src/main/java/org/qortal/utils/NTP.java
+++ b/src/main/java/org/qortal/utils/NTP.java
@@ -129,7 +129,8 @@ public class NTP implements Runnable {
 	}
 
 	public static void shutdownNow() {
-		instanceExecutor.shutdownNow();
+		if (instanceExecutor != null)
+			instanceExecutor.shutdownNow();
 	}
 
 	public static synchronized void setFixedOffset(Long offset) {