Should I deload?

So I am doing Stronglifts 5x5 and while squatting my last rep on my last my legs kind of bent inwards and it looked pretty bad, I managed to pull through though

I mean I guess its good if I'm struggling alot in the last rep of the last set?

I'm not sure I really do not want to injure myself.

This was at a 170 squat by the way .

Thanks