Target Unreachable returned null JSF

i'm writing a small project for me. It should be able to save some attributes to a database. This is my xhtml snippet:

        <h:outputText value="#{desk_messages.map['label.storeId']}" />
        <p:inputNumber minValue="1"   value="#{boxController.entity.store.id}"/>

My Java Code therefore:

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = Box.FK_STORE, referencedColumnName = "id", nullable = false)
@Index(name = "IDX_Box_Store")
public Store getStore() {
    return this.store;
}

public void setStore(final Store store) {
    this.store = store;

    this.markHashCodeComputationAsNeeded();
}

If i'm executing this, my JBoss throwing the PropertyNotFoundException with the Text: Target Unreachable 'store' returned null. I think it should working, can somebody help me please?

It seems like store is null so you cant access to store.id, try to debug and check the content of your store.

EDIT: Try something like this:

 public void recoverEmptyObjects(){
        if(store == null ) 
          {store = new Store();}
 }