循环链表的内存错误:未分配正在释放的指针

程序运行并且测试确实成功，但是在列表和测试结果之间，我得到这个： assignment_2.2(10729,0x7fff78db0300) malloc：* 对象 0x7fb132d00000 的错误：未分配正在释放的指针 *在malloc_error_break中设置断点进行调试 知道我该如何解决这个问题吗？

主.cpp

#include "OLinkedList.h"
using namespace std;
int main(int argc, char** argv) {
OLinkedList CircleList;
CircleList.fillList(0);
CircleList.prntList();
CircleList.OTest();
return 0;
}

OLinkedList.h

#ifndef OLINKEDLIST_H
#define OLINKEDLIST_H
#include <iostream>
#include <iomanip>
using namespace std;
class OLinkedList{
private:    struct Link{
int data;
Link *next;
};
Link *head;
Link *tail;
public:     OLinkedList(){head = nullptr; tail = nullptr;};
~OLinkedList();
void fillList(int);
void prntList();
void OTest();
};
//Destructor for Class used to delete memory of list
OLinkedList::~OLinkedList(){
Link *linkPtr = head;
Link *nextPtr;
//traverses to the end of the list to delete memory
do
{
nextPtr = linkPtr->next;
delete linkPtr;
linkPtr = nextPtr;
}while(linkPtr!= nullptr);
}
//
void OLinkedList::fillList(int size){    
Link *front = new Link; //create first link
head = front; //set first link = to traversal
head->data = size++;         //Fill the front with data
head->next = nullptr;     //Point the front to no where
Link *temp = head;      
do{
Link *end = new Link;   //Create a new link
end->data = size++;     //Fill with data
end->next = nullptr;       //Point to no where
temp->next=end;//Previous link will point to the end
temp=end;  //Now this has become previous link  
tail = end;
tail->next = head;
}while(size < 10);          //Repeat until filled
}
void OLinkedList::prntList(){
Link *linkPtr;
linkPtr = head;
int i = 0;
do{
cout<<"  "<<setprecision(3)<<linkPtr->data;
linkPtr = linkPtr->next;
i++;
}while(i < 10);
}
//Used to prove list is circular
void OLinkedList::OTest(){
Link *linkPtr = tail->next;
cout<<"nAfter "<<tail->data<<" is "<<linkPtr->data;
}
#endif /* OLINKEDLIST_H */