Crash fix

core/src/mindustry/editor/EditorTile.java

@@ -38,6 +38,11 @@ public class EditorTile extends Tile{
         super.setFloor(type);
     }
 
+    @Override
+    public boolean isEditorTile(){
+        return true;
+    }
+
     @Override
     public void setBlock(Block type, Team team, int rotation, Prov<Building> entityprov){
         if(skip()){

core/src/mindustry/world/Tile.java

@@ -285,7 +285,7 @@ public class Tile implements Position, QuadTreeObject, Displayable{
         this.floor = type;
         this.overlay = (Floor)Blocks.air;
 
-        if(!headless && !world.isGenerating()){
+        if(!headless && !world.isGenerating() && !isEditorTile()){
             renderer.blocks.removeFloorIndex(this);
         }
 
@@ -295,6 +295,10 @@ public class Tile implements Position, QuadTreeObject, Displayable{
         }
     }
 
+    public boolean isEditorTile(){
+        return false;
+    }
+
     /** Sets the floor, preserving overlay.*/
     public void setFloorUnder(Floor floor){
         Block overlay = this.overlay;