Negative Number increased damage, no Damage Hammerthrow

I just started my Hammer build so I cant tell if this is a bug before 0.9g2.
This occurs Randomly in Mono , Bossfights and Dungeons. I only can play about 20 min till this happens and games crashes minutes after.
This looks like this:

Hammerskill I use:

Skilltree but nothing special:

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