c++ struct prob

hi all
i really need help on this one as it for my 3rd year project i trying to read a value from a struct it will read the first value grand then after moving to the next record it just tries to read an invalid memory location

value = gatelist->Gate->connectorlist->ptr_to_connector->Value;
// get the value
InputList *newnode;
newnode = getInputList();
newnode->NextInput = NULL;
newnode->input = value; // creates new node to store the value in
newnode->NextInput = ValuesList;
ValuesList->NextInput = newnode;
// adds it onto the list of values that has already being created
gatelist->Gate->connectorlist = gatelist->Gate->connectorlist->nextconnectorlist;
// move to the next node

if any body can help it would be greatly greatly appreciated
tanx in advance