由于while循环中的条件，导致Segmentation错误

我用字符串数组制作了一个哈希表，在插入中，我有一个while语句，用于处理冲突和环绕。我已经试过了，似乎只有在使用条件语句时才会出现分段错误11。这是我的while循环：

while (numElm != length)
{
numProbes = 0;
int index = hash( newGuest );
//handles collision and wraparound
while (hashArray[index] != " " && hashArray[index] != "-1")
{
++index;
index %= length;
numProbes = numProbes + 1;
}
//sets the array at the index eqaul to data
hashArray[index] = newGuest;
cout << newGuest << " has been inserted at index: " << index << " using " << numProbes << " probes";
break;
}

当第二个while循环以两个条件语句开始时，就会出现问题。有人能告诉我为什么会发生这种事吗？

编辑程序的其余部分

#include <cassert>
#include <iostream>
#include <cstdlib>
#include <stdlib.h>
#include <string>
#include "HashTable.h"
using namespace std;
//typedef double value_type;

HashTable::HashTable( int tableLength )
{   
tableLength = 114;
string *hashArray = new string[tableLength];
length = tableLength;
numElm = 0;
for(int i = 0; i < length; i++)
{
hashArray[i] = " ";
}
}

// Returns an array location for a given item key.
int HashTable::hash( string itemKey )
{
int value = 0;
for (int i = 0; i < itemKey.size(); i++ )
{
value += itemKey[i];
}
return (value * itemKey.length() ) % length;
}
// Adds an item to the Hash Table.
void HashTable::insertGuest( string newGuest )
{
//  int index = hash( newGuest );   
//hashArray[ index ].insertGuest( newGuest );
//  cout << newGuest << " has been inserted at index: " << index;
//  string s = " ";
while (numElm != length)
{
numProbes = 0;
int index = hash( newGuest );
//handles collision and wraparound
while (hashArray[index] != " " && hashArray[index] != "-1")
{
++index;
index %= length;
numProbes = numProbes + 1;
}
//sets the array at the index eqaul to data
hashArray[index] = newGuest;
cout << newGuest << " has been inserted at index: " << index << " using " << numProbes << " probes";
break;
}
}
// De-allocates all memory used for the Hash Table.
HashTable::~HashTable()
{
delete [] hashArray;
}
//#endif