From 9ae3efc8f970cb1bb22bed027af56c5c01deae15 Mon Sep 17 00:00:00 2001
From: Ben Fortuna <bfortuna@odecee.com.au>
Date: Mon, 8 Jul 2019 12:43:08 +1000
Subject: [PATCH] Allow for null observances

---
 src/main/java/net/fortuna/ical4j/model/TimeZone.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/net/fortuna/ical4j/model/TimeZone.java b/src/main/java/net/fortuna/ical4j/model/TimeZone.java
index 6427c267b..cd8990960 100644
--- a/src/main/java/net/fortuna/ical4j/model/TimeZone.java
+++ b/src/main/java/net/fortuna/ical4j/model/TimeZone.java
@@ -33,6 +33,7 @@
 
 import net.fortuna.ical4j.model.component.Daylight;
 import net.fortuna.ical4j.model.component.Observance;
+import net.fortuna.ical4j.model.component.Standard;
 import net.fortuna.ical4j.model.component.VTimeZone;
 import net.fortuna.ical4j.model.property.TzId;
 import net.fortuna.ical4j.model.property.TzOffsetFrom;
@@ -195,7 +196,7 @@ private static int getRawOffset(VTimeZone vt) {
             if (offsetFrom != null) {
                 return (int) (offsetFrom.getOffset().getTotalSeconds() * 1000L);
             }
-        } else {
+        } else if (latestSeasonalTime instanceof Standard) {
             final TzOffsetTo offsetTo = latestSeasonalTime.getProperty(Property.TZOFFSETTO);
             if (offsetTo != null) {
                 return (int) (offsetTo.getOffset().getTotalSeconds() * 1000L);