Combine two scripts

[Kerdukie]

Hey guys! :)
(Sheesh, me again, huh?^^")

I have a problem with two scripts I'd like to use in my project.
But I think, that they'll not really like each other! xD"

I'm talking about the "Tywin_Masters" and "Yanfly Engine RD - Display Victory Aftermath" scripts.

Everytime the battle ends an error occurs! :|
It's probably because the "Victory Aftermath" can't add or display the bonus stats that I'll get from a master after leveling up.

Code:

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Project
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Script 'Tywin_Masters' line 577: NoMethodError occurred.

undefined method `+' for nil:NilClass
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OK  
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Maybe someone can fix that problem?
Would be really nice if you could! :)

Here are the two scripts:
Victory Aftermath
Masters
(The master system is'nt really easy, so here's a demo: Demo Masters)

TIA,
Kerdukie

Oh, and merry christmas to all of you! :)

[Edit]
Okay, everything is fixed now! :)
Please close, if someone reads this! xD