Solved While loop causing server to crash

Oddly, my while loop is causing the server to crash. This hasnt been a problem since I've made this system but now when I run the command (the command that triggers the while loop) my server stops responding and crashes, the error points to the while loop. Also, the ItemReader class it a class that converts a config string list to a item with custom stuff I need for my plugin

Error:
http://pastebin.com/qESj7FFv (too long to put into a thread)
Code:

Code:

    public static ItemReader gettingItemStack() {


        boolean chosen = false; 
       
        Random random = new Random();
        double luck = 100.0;
        while (!chosen) // line 114
            for (String prizestring : prizes) {

                ItemReader ir = new ItemReader(prizestring);
                luck = (random.nextDouble()) * 700;
                if (luck <= ir.getPercentage()) {
                    chosen = true;
                    is = ir;

                }

            }
        return is;
    }

 

Am not seeing the class ItemReader, is this Spigot/bukkit/or what ever you use or is it a variable you made. If so can you please post it. This is because the percentage of ir is more then 700 (approximately) I also don't see a variable called is

 

Well its not bukkit or spigot and the variable called is, is a public ItemReader. I dont want to post the full itemreader class since its a personal api, but it converts a string list in a config to use in code. For example,

Material:Gold_Block Name:&cName_Here
itemreader.toItem();
Then it would make a gold block with the name given in the config.

Code:

    public double getPercentage() {
        if (itemString.contains("Percent:")) {
            for (String s : itemString.split(" ")) {
                if (s.contains("Percent:")) {
                    s = s.replace("Percent:", "");
                    return Double.parseDouble(s);
                }
            }
        }
        return 100;
    }

I know the this part is working because the system had been working before it randomly started causing errors at the while loop

 

It is possible that that is returning 0 which means it will never even be lower then zero, since I don't have the full code could you please send the console or yourself a message right before it test the percentage and have it send you the percentage.