Add Region.initSessions

BauSystem_Main/src/de/steamwar/bausystem/region/Region.java

@@ -27,6 +27,7 @@ import de.steamwar.bausystem.region.utils.RegionExtensionType;
 import de.steamwar.bausystem.region.utils.RegionType;
 import de.steamwar.bausystem.shared.SizedStack;
 import de.steamwar.sql.Schematic;
+import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.NonNull;
 import org.bukkit.Location;
@@ -90,7 +91,10 @@ public class Region {
 
     private FlagStorage flagStorage;
 
+    @Getter(AccessLevel.PRIVATE)
     private SizedStack<EditSession> undoSessions;
+
+    @Getter(AccessLevel.PRIVATE)
     private SizedStack<EditSession> redoSessions;
 
     public Region(String name, Prototype prototype, YAPIONObject regionConfig, FlagStorage flagStorage, YAPIONObject regionData) {
@@ -164,6 +168,13 @@ public class Region {
         }
     }
 
+    private void initSessions() {
+        if (undoSessions == null) {
+            undoSessions = new SizedStack<>(20);
+            redoSessions = new SizedStack<>(20);
+        }
+    }
+
     public boolean inRegion(Location location, RegionType regionType, RegionExtensionType regionExtensionType) {
         if (!hasType(regionType)) {
             return false;