Duplicate magazine TrashTinCan detected (id 150:17107) in slots Loot and MolotovCocktailMuzzle Dupl

Can somebady help whet thes problem "Duplicate magazine TrashTinCan detected (id 150:17107) in slots Loot and MolotovCocktailMuzzle" Can maybe somebady explain what is that and how to fix it!
 
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