diff --git a/client.js b/client.js
index d9aa6b4..3b52376 100644
--- a/client.js
+++ b/client.js
@@ -87,24 +87,25 @@ function Client (peerId, port, torrent, opts) {
       } else if (protocol === 'udp:' && typeof UDPTracker === 'function') {
         return new UDPTracker(self, announceUrl)
       } else if ((protocol === 'ws:' || protocol === 'wss:') && webrtcSupport) {
-        // Don't try to add http tracker on an https website
-        if (protocol === 'ws:' && location && location.protocol && location.protocol === 'https:') {
-          process.nextTick(function () {
-            var err = new Error('unsupported http tracker on https: ' + announceUrl)
-            self.emit('warning', err)
-          })
+        // Skip ws:// trackers on https:// sites because they throw SecurityError
+        if (protocol === 'ws:' && typeof window !== 'undefined' &&
+            window.location.protocol === 'https:') {
+          nextTickWarn(new Error('Unsupported tracker protocol: ' + announceUrl))
           return null
         }
         return new WebSocketTracker(self, announceUrl)
       } else {
-        process.nextTick(function () {
-          var err = new Error('unsupported tracker protocol for ' + announceUrl)
-          self.emit('warning', err)
-        })
+        nextTickWarn(new Error('Unsupported tracker protocol: ' + announceUrl))
+        return null
       }
-      return null
     })
     .filter(Boolean)
+
+  function nextTickWarn (err) {
+    process.nextTick(function () {
+      self.emit('warning', err)
+    })
+  }
 }
 
 /**