How to delete a specific value from doubly linked list?

I was given a task with a DOUBLY linked list to delete a specific number from the list. My code is giving an Access Violation error. Even after multiple dry runs, I can't figure out what is wrong. The task basically is to create a search function which finds a specific number in the linked list, and a deletion function which deletes that specific link.

minimal working code:

#include<iostream>
using namespace std;
class dll{
    struct node{
        int data;
        node *next,*prev;
    };
    node *head;
public:
    dll(){
        head=NULL;
    }
    void inatst(int val){
        node *temp=new node;
        temp->data=val;
        temp->next=head;
        head=temp;
    }
    node* search(int val){
        node* cur=head;
        while(cur!=NULL){
            if(cur->data==val){
                cout<<"value found "<<val<<endl;
                return cur;
            }
            cur=cur->next;
        }
        cout<<"value not exist"<<endl;
                    return NULL;
    }
    bool delspval( int val )
{
    node *temp = search( val );
    bool success = temp != nullptr;

    if ( success )
    {
        if ( temp->next != nullptr )
        {
            temp->next->prev = temp->prev;
        }
        
        if ( temp->prev != nullptr )
        {
            temp->prev->next = temp->next;
        }
        else
        {
            head = temp->next;
        }

        delete temp;
    }

    return success;
}
    void display(){
        node*cur=head;
        while(cur!=NULL){
            cout<<cur->data<<" ";
            cur=cur->next;
        }
        cout<<endl;
    }
    ~dll(){
        while(head!=NULL){
            node*cur=head;
            head=cur->next;
            delete cur;
            cur=head;
        }
    }
};
void main(){
    dll l1;
    l1.inatst(1);
    l1.inatst(2);
    l1.inatst(3);
    l1.inatst(4);
    l1.inatst(5);
    l1.inatst(6);
    l1.display();
    l1.delspval(3);
    system("pause");
}

In the above given code, the line temp->prev->next=temp->next; is giving the error. I'm pretty much a beginner at linked lists, so any help would be appreciated.