Broken main stem while stress training

So I was doing a bit of super cropping and the main stem sorta snapped but not completely off
.....would it heal itself or do I have to tape it ?
The top half is still very much on the plant but you can tell the inside is broken !!!!:lot-o-toke::nervous-guy::hmmmm:
Had the same thing happen the other day had no tape so used cable ties worked a treat !!
 
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