Array empty value

Hi There,

I am having an issue with arrays. I’m using this code as a part of my program

  PreviousUpTick = CurrentUpTick;
      CurrentUpTick = Ask;
   PreviousDnTick = CurrentDnTick;
      CurrentDnTick = Ask;
   
   if (CurrentUpTick < PreviousUpTick ) 
       DnTick[0]++;
   if (CurrentDnTick > PreviousDnTick ) 
       UpTick[0]--;
       Draw[0]= UpTick[0]+DnTick[0];

When using only this simple code to bump up or down a histogram it works well. Every array starts at value 0 and gets added or subtracted accordingly by 1 on every iteration. When I use this in another script that plots objects instead on a histogram the arrays are getting assigned EMPTY_VALUE, so it starts bumping up or down from 214783647 instead of 0 although I initialized all arrays with 0.

I would appreciate any help or clue.

Thanks.