diff --git a/client/scripts/network.js b/client/scripts/network.js
index d4ed0d9..2e5a59a 100644
--- a/client/scripts/network.js
+++ b/client/scripts/network.js
@@ -194,12 +194,12 @@ class Peer {
 
     _onChunkReceived(chunk) {
         if(!chunk.byteLength) return;
-        
+
         this._digester.unchunk(chunk);
         const progress = this._digester.progress;
         this._onDownloadProgress(progress);
 
-        // occasionally notify sender about our progress 
+        // occasionally notify sender about our progress
         if (progress - this._lastProgress < 0.01) return;
         this._lastProgress = progress;
         this._sendProgress(progress);
@@ -261,7 +261,7 @@ class RTCPeer extends Peer {
     }
 
     _openChannel() {
-        const channel = this._conn.createDataChannel('data-channel', { 
+        const channel = this._conn.createDataChannel('data-channel', {
             ordered: true,
             reliable: true // Obsolete. See https://developer.mozilla.org/en-US/docs/Web/API/RTCDataChannel/reliable
         });
@@ -309,7 +309,7 @@ class RTCPeer extends Peer {
 
     _onChannelClosed() {
         console.log('RTC: channel closed', this._peerId);
-        if (!this._isCaller) return;
+        if (!this._isCaller || !this._conn) return;
         this._connect(this._peerId, true); // reopen the channel
     }