diff --git a/build.gradle b/build.gradle
index 7c7587c7fc..bd4d2c3c6d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -33,8 +33,8 @@ allprojects {
     version = '1.0.1'
     ext {
         appName = "Unciv"
-        appCodeNumber = 411
-        appVersion = "3.7.5"
+        appCodeNumber = 412
+        appVersion = "3.7.5-patch1"
 
         gdxVersion = '1.9.10'
         roboVMVersion = '2.3.1'
diff --git a/core/src/com/unciv/logic/civilization/TechManager.kt b/core/src/com/unciv/logic/civilization/TechManager.kt
index fd79c37430..8d048f51f7 100644
--- a/core/src/com/unciv/logic/civilization/TechManager.kt
+++ b/core/src/com/unciv/logic/civilization/TechManager.kt
@@ -260,7 +260,7 @@ class TechManager {
         for (city in civInfo.cities)
             for(constructionName in city.cityConstructions.constructionQueue.toList()){ // copy, since we're changing the queue
                 if(constructionName !in obsoleteUnits) continue
-                val constructionUnit = city.cityConstructions.getCurrentConstruction() as BaseUnit
+                val constructionUnit = city.cityConstructions.getConstruction(constructionName) as BaseUnit
                 city.cityConstructions.constructionQueue.replaceAll { if(it==constructionName) constructionUnit.upgradesTo!! else it }
             }