From c53356b4913f14769e5e951ec43db8546f650484 Mon Sep 17 00:00:00 2001
From: IhateTrains <IhateTrains@users.noreply.github.com>
Date: Thu, 28 Mar 2024 18:43:52 +0100
Subject: [PATCH] Fix InvalidOperationException while converting governorships
 (#1857) #patch

Sentry event ID: 37a9fed8f2c64cf8a66e2e52f380f546
---
 ImperatorToCK3/Mappers/TagTitle/TagTitleMapper.cs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ImperatorToCK3/Mappers/TagTitle/TagTitleMapper.cs b/ImperatorToCK3/Mappers/TagTitle/TagTitleMapper.cs
index 0af5e7056..3cdb1c76b 100644
--- a/ImperatorToCK3/Mappers/TagTitle/TagTitleMapper.cs
+++ b/ImperatorToCK3/Mappers/TagTitle/TagTitleMapper.cs
@@ -139,9 +139,13 @@ public void RegisterGovernorship(string imperatorRegion, string imperatorCountry
 		var countryCapitalDuchy = ck3CapitalCounty.DeJureLiege;
 		
 		foreach (var county in titles.Where(t => t.Rank == TitleRank.county)) {
-			ulong capitalBaronyProvinceId = (ulong)county.CapitalBaronyProvinceId!;
+			if (!county.CapitalBaronyProvinceId.HasValue) {
+				// Title has no capital barony province.
+				continue;
+			}
+			ulong capitalBaronyProvinceId = county.CapitalBaronyProvinceId.Value;
 			if (capitalBaronyProvinceId == 0) {
-				// title's capital province has an invalid ID (0 is not a valid province in CK3)
+				// Title's capital province has an invalid ID (0 is not a valid province in CK3)
 				continue;
 			}