I had something similar to his on my kookaburra kahuna, just a little lower down i think. Kookaburra effectively washed their hands of it and told me that it was not a manufacturing fault and that i could take it up with my retailer if i wanted but not them.
I had owned mine for a season and a half i think but used it for just under a season.
Choice Willow said there was no point repairing it and to just use it till the middle died or the bat split in half
The middle died a couple of net sessions after i noticed the crack