From 84f41341f6aedbb2e86b9184ab5ebe658a638928 Mon Sep 17 00:00:00 2001
From: Jack Rainy <JackRainy@users.noreply.github.com>
Date: Sat, 11 Apr 2020 21:37:06 +0300
Subject: [PATCH] Do not allow to build great improvement, if it already exists
 here (#2382)

---
 core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt b/core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt
index faa0407f9e..9360911c8e 100644
--- a/core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt
+++ b/core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt
@@ -364,7 +364,9 @@ object UnitActions {
                         }
                         addGoldPerGreatPersonUsage(unit.civInfo)
                         unit.destroy()
-                    }.takeIf { unit.currentMovement > 0f && !tile.isWater && !tile.isCityCenter() && !tile.getLastTerrain().impassable })
+                    }.takeIf { unit.currentMovement > 0f && !tile.isWater &&
+                            !tile.isCityCenter() && !tile.getLastTerrain().impassable &&
+                            tile.improvement != improvementName })
         }
         return null
     }