Reading here and there about stalling issues. It may depend on individual characteristics for every bike.
My Duke had occasional stalls even at stock. Pretty much the same with the LeoVince exhaust. More so with DB-killer out. Even after loading Akra maps the stalling was occuring from time to time. Most on pretty hard decel and before stopping at traffic lights and such.
But now I have modified the mapping myself using TuneECU in the lower part of the L-maps (Air Pressure). Since then, no stalling.

Adjusted low pressure(high vaccum) by increase values gradually by up to 4% towards the end in the lower end hPa under 2900 rpm.
NOTE: If you might be experiencing gradually more and more stalling there might be issues with proper fuelling due to clogged fuel filter/pump or injector and you will have to sort this out first.