Bike stalls when put in 1st gear

Kickstand still down? My Ninja 300 will shut-off if you try putting it into gear, with the kickstand down.
 
If the kickstand is down, put the kickstand up.

If the kickstand is up, clean/replace the side stand switch.
 
Since you say stall, you mean it putters out and dies or just shuts off instantly?

If stalling while engaging into first gear, most likely your carbs are gummed up and need some seafoam, carb cleaner, etc. Does the same happen when you rev up high briefly and let go of the throttle in idle?
 
White lithium grease all over your sidestand switch

Push on it by hand a couple dozen times

Report back
 
Perhaps it is an older bike that does not have a sidestand switch. Is the clutch dragging? More info needed.
 

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