It's uncanny. Exactly the same scenario with me -- I tried using two Salesmen Weekly magazines, failed a character dialog anyway, reloaded the savegame, and boom, got the error. Have tried to load FOUR previous manual saves, all with the same error.
If these savegame files are corrupt, I've lost four hours of game time.
BTW, I'm using the Mercenary Pack.
when i first encountered this bug, it was with the auto-save file, i was still able to load my manual saves however
later, this bug re-appeared, after i had entered a new area, i wanted to test something, so i have saved the game, i went and tried to use two magazines at once so i could access a terminal, i discovered that you can only activate one magazine, which was why i saved in case it wasn't possible, so i procedded to re-load from my previous save, which gave me the above error message, i tried my other save, same message, and the same message for the auto-save.
my current theory of re-producing the bug is untested, however it seems to have occurred after i save, i proceed to do an action, and if the action fails, in-game, i select to load the save, and the bug happens, i cannot gurantee that this is why the bug occurs, or an 100% solution.