Solved a crash situation when clicking on "Future Tech" when it has already been researched

core/src/com/unciv/GameStarter.kt

@@ -15,7 +15,6 @@ import kotlin.math.min
 
 class GameParameters{
     var difficulty="Prince"
-    var nation="Babylon"
     var mapRadius=20
     var numberOfHumanPlayers=1
     var humanNations=ArrayList<String>().apply { add("Babylon") }

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

@@ -12,7 +12,7 @@ import com.unciv.ui.utils.getRandom
 
 class GameInfo {
     var civilizations = mutableListOf<CivilizationInfo>()
-    var difficulty="Chieftain" // difficulty is game-wide, think what would happen if 2 human players could play on diffferent difficulties?
+    var difficulty="Chieftain" // difficulty is game-wide, think what would happen if 2 human players could play on different difficulties?
     var tileMap: TileMap = TileMap()
     var gameParameters=GameParameters()
     var turns = 0

core/src/com/unciv/logic/civilization/TechManager.kt

@@ -73,7 +73,10 @@ class TechManager {
 
         while (!checkPrerequisites.isEmpty()) {
             val techNameToCheck = checkPrerequisites.pop()
-            if (isResearched(techNameToCheck) || prerequisites.contains(techNameToCheck))
+            // future tech can have been researched even when we're researching it,
+            // so...if we skip it we'll end up with 0 techs in the "required techs", which will mean that we don't have annything to research. Yeah.
+            if (techNameToCheck!="Future Tech" &&
+                    (isResearched(techNameToCheck) || prerequisites.contains(techNameToCheck)) )
                 continue //no need to add or check prerequisites
             val techToCheck = GameBasics.Technologies[techNameToCheck]
             for (str in techToCheck!!.prerequisites)

core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt

@@ -9,7 +9,6 @@ import com.unciv.models.gamebasics.GameBasics
 import com.unciv.models.gamebasics.tech.Technology
 import com.unciv.models.gamebasics.tr
 import com.unciv.ui.utils.*
-import com.unciv.ui.worldscreen.optionstable.PopupTable
 import java.util.*
 import kotlin.collections.HashSet
 
@@ -69,18 +68,7 @@ class TechPickerScreen(internal val civInfo: CivilizationInfo) : PickerScreen()
                     val techButton = TechButton(tech.name,civTech)
 
                     techNameToButton[tech.name] = techButton
-                    techButton.onClick {
+                    techButton.onClick { selectTechnology(tech) }
-                        try {
-                            selectTechnology(tech)
-                        }catch (ex:Exception){
-                            val popup = PopupTable(this)
-                            popup.addGoodSizedLabel("You've encountered an error that I've been trying to pin down for a while.").row()
-                            popup.addGoodSizedLabel("If you could copy your game data (menu-save game-copy to clipboard - paste into an email to yairm210@hotmail.com)").row()
-                            popup.addGoodSizedLabel("That would be really helpful to me, thanks!").row()
-                            popup.addGoodSizedLabel("If you also add what tech you clicked on to get this error that would be even better!").row()
-                            popup.open()
-                        }
-                    }
                     topTable.add(techButton)
                 }
             }

core/src/com/unciv/ui/saves/LoadScreen.kt

@@ -4,7 +4,6 @@ import com.badlogic.gdx.Gdx
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.scenes.scene2d.ui.Table
 import com.badlogic.gdx.scenes.scene2d.ui.TextButton
-import com.badlogic.gdx.utils.Json
 import com.unciv.UnCivGame
 import com.unciv.logic.GameInfo
 import com.unciv.logic.GameSaver
@@ -69,7 +68,7 @@ class LoadScreen : PickerScreen() {
             try{
                 val clipboardContentsString = Gdx.app.clipboard.contents.trim()
                 val decoded = Gzip.unzip(clipboardContentsString)
-                val loadedGame = Json().fromJson(GameInfo::class.java, decoded)
+                val loadedGame = GameSaver().json().fromJson(GameInfo::class.java, decoded)
                 loadedGame.setTransients()
                 UnCivGame.Current.loadGame(loadedGame)
             }catch (ex:Exception){