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Random Question Widget sometimes displays same question multiple times. Lets say you have set the number of random questions to be 2. From the set of total 5 questions that I had in my db, i repeatedly noticed that the random question plugin displays same question multiple times.

Q2A version: Q2A 1.5.4
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I am not that good in php, but as far as I understand the code, it just adds a random question without looking if this question had been selected before.
This problem should occure in very small databases very often.

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