c - I am getting Segmentation fault (core dumped) for below code.Please help me out -

void sortedinsert(struct node** headref, struct node* newnode) {         struct node* current= *headref;          if(newnode->data<current->data)         {                 newnode->next=current;                 *headref=newnode;         }         else         {                 current=current->next;                                   while(current!=null)                 {                          if(newnode->data<current->next->data)                                 break;                  current=current->next;                 }                  newnode->next=current->next;                 current->next=newnode;         } } 

consider case when insert @ end of list. get

// current = null current->next = nextnode; // ((struct node*)null)->next = nextnode;