Hero Leveling Skip

On my RPG you get 1 lumber every time you level up. But it seams that if a hero gains more then one level after killing an opponent, then they only get one piece of lumber, as they only leveled up in one go. How would I fix this so that after 100 levels you have gained 99 pieces of lumber and not less?

Maybe you can write in a var, the wood allready given, and when the hero get level you test, and give the difference(and update the var).

when the hero levels up, set the lumber to the lvl of the hero - 1, that will solve yur problem

Unless, of course, you can spend the lumber on things. I suggest you use an integer variable array to store last level gained for each hero, and whenever he gains a level add as much lumber as there is the difference between the new level of the hero and the value of the variable, and then update the variable.