Integer Overflow in com.rapidminer.operator.meta.ParameterIteration.java in 7.5+

[s-j-v-zelst]

Dear RapidMiner team,

(I develop the RapidProM extension for RM).
I found a (severe) bug in the "Loop Parameters" operator

In my experiments (I'm a researcher) I use the "Loop Parameters" operator a lot (com.rapidminer.operator.meta.ParameterIteration.java).
I just found out that in the doWork() method, the actual number of combinations (int numberOfCombinations) is counted twice.
In case of a very large number of iterations (which tends to happen in large scale experiments), the variable reaches an overflow and becomes negative.
As a result I get a UserError related to the fact that no valid parameter combination can be generated, i.e.:

if (numberOfCombinations < 1 || values.length == 0) {
throw new UserError(this, 958);
}

I can see some ways how to fix this, however, since I'm not very familiar with the meaning of all variables within the operator I guess it is best if one of you guys fixs this.

cheers,

Bas.