If it's in the handle, flatten out the back, Put a lot of glue in the crack, add a layer of wood, use a good wood glue.
Give it at least 72 hours for the glue to set.
Round off all the edges, then start wrapping. I put down a coat of Gorilla glue and wrap at least a couple of inches past where the crack is. I use twisted nylon line. Once I have everything wrapped, I wet it and let the glue expand through the wrapping. Sand lightly.
That should keep the crack from lifting. Or maybe not.