bugfixes

core/src/io/anuke/mindustry/entities/type/base/RepairDrone.java

@@ -5,6 +5,7 @@ import io.anuke.mindustry.entities.type.TileEntity;
 import io.anuke.mindustry.entities.units.UnitState;
 import io.anuke.mindustry.world.Pos;
 import io.anuke.mindustry.world.Tile;
+import io.anuke.mindustry.world.blocks.*;
 
 import java.io.*;
 
@@ -23,6 +24,10 @@ public class RepairDrone extends BaseDrone{
                 target = Units.findDamagedTile(team, x, y);
             }
 
+            if(target instanceof TileEntity && ((TileEntity)target).block instanceof BuildBlock){
+                target = null;
+            }
+
             if(target != null){
                 if(target.dst(RepairDrone.this) > type.range){
                     circle(type.range * 0.9f);