Error when saving for the first time | Save/Load System

Hello,

I have a problem with a NullReferenceException which I can’t find.
I have programmed a save/load system with the help of the following tutorial:

Unfortunately, I have the problem that whenever I like to save for the first time the error occurs.
The error is fixed by clicking the first time on Load.

Can someone help me with this problem?

The Error:

NullReferenceException: Object reference not set to an instance of an object

PlotManager.SaveData (GameData data) (at Assets/Scripts/PlotManager.cs:68)

DataPersistenceManager.SaveGame () (at Assets/Scripts/SaveSystem/DataPersistenceManager.cs:50)

PauseManager.SaveGameBtn () (at Assets/Scripts/PauseManager.cs:17)

...

Plot Manager:

Code (CSharp):

1. public void SaveData(GameData data) {
2.     if (data.isBought.ContainsKey(id)) { //Line 68
3.         data.isBought.Remove(id);
4.     }
5.     data.isBought.Add(id, isBought);
6. }

Data Persistence Manager:

Code (CSharp):

1. public void SaveGame() {
2.     foreach (IDataPersistence dataPersistenceObj in dataPersistenceObjects) {
3.         dataPersistenceObj.SaveData(gameData); //Line 50
4.     }
5.  
6.     dataHandler.Save(gameData);
7. }

PauseManager:

Code (CSharp):

1. public void SaveGameBtn() {
2.     DataPersistenceManager.instance.SaveGame(); //Line 17
3. }

 

As your error says, it occurs on line 68 in your code.

Either you can send here in your Code or check line 68.

 

Either "data" is null or "data.isBought" is null. I'm guessing isBought probably needs to be initialized.

 

Thank you for your quick answer. That’s right. It’s not initialized.

 

The guy who made the video made mistakes and offers corrections in this one.

 

Believe it or not, there's one answer that works for ALL NullReferenceExceptions.

The answer is always the same... ALWAYS!

How to fix a NullReferenceException error

https://forum.unity.com/threads/how-to-fix-a-nullreferenceexception-error.1230297/

Three steps to success:
- Identify what is null <-- any other action taken before this step is WASTED TIME
- Identify why it is null
- Fix that