From 0e68a23d292694979335e94010c36b001d4d5475 Mon Sep 17 00:00:00 2001
From: Duan Tao <duantao@live.cn>
Date: Fri, 10 May 2019 23:12:35 +0800
Subject: [PATCH] Fix crash.

---
 core/src/com/unciv/logic/city/CityInfo.kt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/com/unciv/logic/city/CityInfo.kt b/core/src/com/unciv/logic/city/CityInfo.kt
index 9a2f8d8fd7..a73a9ccdd7 100644
--- a/core/src/com/unciv/logic/city/CityInfo.kt
+++ b/core/src/com/unciv/logic/city/CityInfo.kt
@@ -269,7 +269,7 @@ class CityInfo {
         }
 
         for(building in cityConstructions.getBuiltBuildings()
-                .filter{ it.uniqueTo != newCivInfo.civName && it.replaces != ""}) {
+                .filter{ it.uniqueTo != newCivInfo.civName && it.replaces != null}) {
             cityConstructions.removeBuilding(building.name)
             cityConstructions.addBuilding(building.replaces!!)
         }