Apparently .replaceAll is incompatible with Android 5.1, but hey who needs them.

android/build.gradle

@@ -21,8 +21,8 @@ android {
         applicationId "com.unciv.app"
         minSdkVersion 14
         targetSdkVersion 28
-        versionCode 219
-        versionName "2.14.1"
+        versionCode 220
+        versionName "2.14.1.patch1"
     }
 
     // Had to add this crap for Travis to build, it wanted to sign the app

core/src/com/unciv/logic/GameInfo.kt

@@ -143,7 +143,10 @@ class GameInfo {
                 // As of 2.14.1, changed Machu Pichu to Machu Picchu
                 val oldMachuName = "Machu Pichu"
                 val newMachuName = "Machu Picchu"
-                cityConstructions.builtBuildings.replaceAll { if (it == oldMachuName) newMachuName else it }
+                if(cityConstructions.builtBuildings.contains(oldMachuName)){
+                    cityConstructions.builtBuildings.remove(oldMachuName)
+                    cityConstructions.builtBuildings.add(newMachuName)
+                }
                 if (cityConstructions.currentConstruction == oldMachuName)
                     cityConstructions.currentConstruction = newMachuName
                 if (cityConstructions.inProgressConstructions.containsKey(oldMachuName)) {