If you are using an older save than chapter 11 part 2, I might have found a fix for you and would like to hear from you.
while investigating this error that mizilic posted above, I found out that some variables and flags are not defined until you press new game.
I may have been able to create a fix for that and would like to get some feedback if some brave people are willing to test it out.
All you need to do is just download the file in this post anywhere into your game folder (TAC/game). This should be a standalone fix and does not need any other mod or files to work.
Edit 16.05.2020
Some saves were having problems with martincheat flag. It’s default set to False so if you want to change that you should be able to change it through Notepad++ or similar program
Please if you have any problems after loading a save, let me know.
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