Hacking is cheating. If you know how to hack a slot machine, you should see the above. But, in fact, it is almost impossible to hack properly protected and tested gambling software. If you find the defects accidentally, you’d better forget about them. The temptation to get lots of money for free will be strong, but you must resist.
It is much better to remain a law-abiding person. All you have to do is contact this online casino's customer support team and inform them of your find. You can even make some money by asking for rewards. First, you should discuss the terms of the reward and only then let them know about the bug.