problem with a linked list

[sumsar]

Im trying to make a linked list / a lobby but for some reason when i try to add a new player the program crashes.
what am I doing wrong ?

#include<iostream>
#include<string>
using namespace std;

class player{
	public:
		player(string x = ""){
			name = x;
		}
		string getname(){
			return name;
		}
		player * getnext(){
			return pnext;
		}
		
		void setnext(player * x){
			pnext = x;
		}
		
	private:
		string name;
		player * pnext = 0; 
		
};

class lobby{
	public:
		void addplayer(string name){
			player * newplayer = new player(name);
			
			if(phead = 0){
				phead = newplayer;
			}
			else{
				player * iter = phead;
				while(iter != 0){
					iter = iter->getnext();
				}
				iter -> setnext(newplayer);
			}
		}
	private:
		player * phead = NULL;
};


main(){
	lobby lob1;
	lob1.addplayer("Rasmus");
	lob1.addplayer("Søren");
	lob1.addplayer("Malle");
}

[ne555]

http://www.cplusplus.com/reference/list/list/

				while(iter != 0){ //line 37
					iter = iter->getnext();
				}
				iter -> setnext(newplayer); //¿what value does `iter' have here?