program crashes by rentering the Game

hi guys need help with this code.
the program crashes by rentering the game at line 37
startup :37: attemp to index ? ( a nil value )
but after reboot the program works

http://pastebin.com/27v395ph

On line 37 you attempt to index into DTData, T0, and T0.Tanks. The first is a table for sure, so either T0 or T0.Tanks must be nil.

Perhaps you should print out what T is so you can see its value immediately before the error…?

ty for reply and
Can it be that with the singleplayer the computer continues where he has stopped? because he doesnt restart by entering the game

if im starting the program then,
local T0 = sensor.getTargetDetails(T) T0= data… T = 2,-2,-4
DTData["T"] = T0.Tanks[1]
local D0 = sensor.getTargetDetails(D) D0= data… D= 2,-2,2
DTData["D"] = D0.Tanks[1]

after logout and joining the game T0 = nil cause T= nil D0 same but on line 75 ive the function for T and D

On line 27 you set T to k, but only if a certain pair of conditions are being met. Presumably they aren't.

arg ty so much… after entering the game the ccsensor recievs the first data after 1-2secs so i need a delay by starting the program ty^^