peer.nativeClose is undefined?

[nature-li]

if these code a bug? I think nativeClose is undefined. these code is in RTCPeerConnection.js:

` peer.nativeClose = peer.close; peer.close = function() { if (!peer) { return; } try { if (peer.nativeClose !== peer.close) { peer.nativeClose(); } } catch (e) {} peer = null; self.peer = null; };

this.peer = peer;`