95a9cb94d5
The level hash uses the NULL value as the indicator of a free entry in a bucket. So, inserting a NULL value breaks the hash and can lead to a bucket overflow. In case of the collision counter, the value wasn't initialized, since it's not needed for the purpose of checking collisions. As a result, it might contain any garbage from the stack and in some rare cases the value was NULL. Now the value is initilized.
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