SceneScriptManager fix nullPointer error

Merge pull request #1581 from akatatsu27/development

src/main/java/emu/grasscutter/scripts/SceneScriptManager.java

@@ -213,7 +213,7 @@ public class SceneScriptManager {
 			}
 
             for(int entityId : region.getEntities()) {
-                if(!region.getMetaRegion().contains(getScene().getEntityById(entityId).getPosition())) {
+                if(getScene().getEntityById(entityId) == null || !region.getMetaRegion().contains(getScene().getEntityById(entityId).getPosition())) {
                     region.removeEntity(entityId);
 
                 }