I somehow managed to insert the gun turrets that I was holding into my ammo slot for my assault rifle while selecting the ammo stored in the same slot. Caused my game to freeze. I was playing Factorio Experimental version 0.17.x or 0.17.1. I'm not 100% sure if my ammo run dry or I just switched the turrets I was holding for the ammo in my ammo slot, most probably the latter. I remember that before opening my inventory to see what happened (a second before it froze), I saw the hand icon selected on my gun turrets which were in the ammo slot for my assault rifle. As soon as I deselected it, game froze. Attaching Screenshots and Log, hope this helps. Amazing work with the new update though and the game in general! <3 Big Fan!\
P.S. It would have been extremely cool if I shot the turret out of my gun or it caused me to blow up as I tried to do it xD. Maybe Next time.