segmentation fault

Please help me debug why I'm getting this fault:

relevent code:

closePrime** arr;

#include "multiQ.h"

using namespace std;

multiQ :: ~multiQ(){ for(int i = 0; i

multiQ :: multiQ(int ArrSize, int digits[]){ if(ArrSize

bool multiQ :: Addnew(closePrime * newCP){ if(!IsFull()){ arr[CurrSize] = newCP; CurrSize++; return true; } return false; } bool multiQ :: Remove(){ if(!IsEmpty()){ CurrSize--; delete arr[CurrSize]; return true; } return false; }