broken main stem

Hi! So this is my first autoflower grow and I'm currently 5 weeks into growth, the plant is still in its veg state, no sign of flowers yet! I gave them their regular (every two days) feeding before I went into work at 12 today and all of them looked amazing and healthy! I came back 5 hours later...

I was reposition one of the ties on my main stem because it slid down a bit, and accidentally caused a small break in my main cola stem. I immediately taped it up. It is a fairly small break, and before I taped it the stem actually stood up the same way it does when supported with tape. When I...