OnNewSave Issue

Your code currently does this;

void OnNewSave(string filename)
{
    Data.ClearAll();
}

Inside RaidData.ClearAll() if then dereferences;

if (INSTANCE.config.ClearBonusesOnReset)

But INSTANCE is not assigned until;

private void OnServerInitialized()
{
    INSTANCE = this;
    LoadData();
    ...
}

Meaning, OnNewSave it can run before InServerInitialized, so INSTANCE is basically NULL and then there is an exception.

You should consider the following:

• Remove the RaidData class’s dependency on the static plugin instance.
• Load the existing persisted data during OnNewSave.
• Pass the clear-bonuses setting into ClearAll.
• Save the cleared data immediately.
• Establish the new reset timestamp.