From 43b47227ebdcb4e4868207db43c3a82bed48ad5c Mon Sep 17 00:00:00 2001
From: Rene Floor <r.floor.1@gmail.com>
Date: Mon, 4 Nov 2019 10:33:28 +0100
Subject: [PATCH] Checking for int.MinValue separately.

For some reason GetField("MinValue") can fail on integers.
---
 .../DataTypes/RecurrencePatternSerializer.cs              | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net-core/Ical.Net/Serialization/DataTypes/RecurrencePatternSerializer.cs b/net-core/Ical.Net/Serialization/DataTypes/RecurrencePatternSerializer.cs
index 5bb506f38..18e4a3968 100644
--- a/net-core/Ical.Net/Serialization/DataTypes/RecurrencePatternSerializer.cs
+++ b/net-core/Ical.Net/Serialization/DataTypes/RecurrencePatternSerializer.cs
@@ -75,6 +75,14 @@ public virtual void CheckMutuallyExclusive<T, TU>(string name1, string name2, T
             {
                 return;
             }
+
+            // For some reason GetField("MinValue") sometimes returns 'null' when the obj is an int
+            // Casting the object to an int and directly checking for MinValue works though.
+            if (obj1 is int c && c == int.MinValue)
+            {
+                return;
+            }
+
             // If the object is MinValue instead of its default, consider
             // that to be unassigned.