diff --git a/core/src/com/unciv/ui/cityscreen/ConstructionsTable.kt b/core/src/com/unciv/ui/cityscreen/ConstructionsTable.kt
index 11cd3c9c9a..8fe935a7e2 100644
--- a/core/src/com/unciv/ui/cityscreen/ConstructionsTable.kt
+++ b/core/src/com/unciv/ui/cityscreen/ConstructionsTable.kt
@@ -128,7 +128,7 @@ class ConstructionsTable(val cityScreen: CityScreen) : Table(CameraStageBaseScre
             purchaseConstructionButton = TextButton("Buy for [$buildingGoldCost] gold".tr(), CameraStageBaseScreen.skin)
             purchaseConstructionButton.onClick("coin") {
                 YesNoPopupTable("Would you like to purchase [${construction.name}] for [$buildingGoldCost] gold?".tr(), {
-                    city.cityConstructions.purchaseBuilding(city.cityConstructions.currentConstruction)
+                    city.cityConstructions.purchaseBuilding(construction.name)
                     update()
                 }, cityScreen)
             }
diff --git a/core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt b/core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt
index 0bbd86301d..a54ef4fcab 100644
--- a/core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt
+++ b/core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt
@@ -50,7 +50,6 @@ class TechPickerScreen(internal val civInfo: CivilizationInfo) : PickerScreen()
             techMatrix[technology.column!!.columnNumber][technology.row - 1] = technology
         }
 
-        val alreadyDisplayedEras = HashSet<String>()
         val eras = ArrayList<Label>()
         for(i in techMatrix.indices) eras.add(Label("",CameraStageBaseScreen.skin).apply { setFontColor(Color.WHITE) })
         eras.forEach { topTable.add(it) }
@@ -77,13 +76,14 @@ class TechPickerScreen(internal val civInfo: CivilizationInfo) : PickerScreen()
         }
 
         // Set era names (column by column)
+        val alreadyDisplayedEras = HashSet<String>()
         for(j in techMatrix.indices)
             for(i in 0..9)
             {
                 val tech = techMatrix[j][i]
                 if(tech==null) continue
                 val eraName = tech.era().name
-                if(!alreadyDisplayedEras.contains(eraName)) { // name of era was not yet set
+                if(!alreadyDisplayedEras.contains(eraName)) { // name of era was not yet displayed
                     eras[j].setText("$eraName era".tr())
                     alreadyDisplayedEras.add(eraName)
                 }