C++ Not sure how to solve case

I am reading the following file:

The Problem:

I can successfully delete the linked list node containing the id "1234568", but I am not sure how to handle if the input file requests to delete that same node again. As my code stands, there will be an error if it tries to delete something that no longer exists.

My function that reads the file:

NOTE: Entire Program is not shown

{id: 1234567, first: Mary, last: Green, DOB: 1996-10-03, GPA: 4.0} {id: 1234568, first: Peter, last:White, DOB: 1997-05-22,GPA: 3.8) {id:1354238, first:Nick, last:Park, DOB: 1995-08-18, GPA: 4.0} {id: 1434587, first: Katy, last: Green, DOB: 1995-08-18, GPA:4.0} delete 1234568 {id: 1534570, first:Peter, last:White, DOB: 1997-05-22,GPA: 3.8} {id: 1634567, first: Mary, last: Green, DOB: 1996-10-03,GPA:4.0} {id: 1734568, first: Peter, last:White, DOB: 1997-05-22, GPA: 3.8) {id: 1854238, first: Nick, last:Park, DOB: 1995-08-18, GPA:4.0} {id: 1934587, first:Katy, last: Green, DOB: 1995-08-18, GPA: 4.0} delete 1234568 {id: 1234570, first: Peter, last:White, DOB: 1997-05-22,GPA: 3.8} bool LinkedList::readFile(string filename) { ifstream ifs(filename); string str; while (getline(ifs,str)) { str.erase (remove(str.begin(), str.end(), ' '), str.end(); str.erase(remove(str.begin(), str.end(), ' '), str.end(); if (str.find("delete") != string::npos) { int loc = str.find("delete") + 6; int loc2 = str.find(' '); loc++; int key = stoi(str.substr(loc, loc2 - loc)); deleteItem(key); else if (str.find("del") != string::npos) { int loc = str.find("del") + 3; int loc2 = str.find(' '); loc++; int key = stoi(str.substr(loc, loc2 - loc)); deleteItem(key); else { additem(str); return true; void LinkedList::deleteItem(int key) { Node* curr; Node* prev; Node* temp = new Node; if (head == NULL) { cout id != key)) { prev = curr; curr = curr->next; if (curr == head) { head = head->next; else { prev->next = curr->next; if (curr->next == NULL) { temp = prev; delete(curr)