herb counter

I'm trying to write herb counter so I can know how much different herbs I have found
but when I add an action

#action {Znajdujesz %0 %1 %2.} {#variable %2 1;#math %2 %2+1}
# action: {Znajdujesz %0 %1 %2.} {#variable %2 1;#math %2 %2+1} color={0} priority={5} tag={} added.

this action worked like this:

# variable: {korzen}={1} added.
math: exception: korzen+1
name 'korzen' is not defined
Znajdujesz bialy okazaly korzen.  <- this trigered action

at first it created variable "korzen" but when it tryed to add 1 to this variable an exeption appeared that variable "korzen" is not defined and I don't understand why, thought variable was added




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