diff --git a/web/app/assets/javascripts/wizard/gear_utils.js b/web/app/assets/javascripts/wizard/gear_utils.js
index 6c625f585..c2b733e68 100644
--- a/web/app/assets/javascripts/wizard/gear_utils.js
+++ b/web/app/assets/javascripts/wizard/gear_utils.js
@@ -37,7 +37,13 @@
     var isNoInputProfile = gearUtils.isNoInputProfile(profile);
     var expectedLatency = context.jamClient.FTUEGetExpectedLatency();
     var audioLatency = expectedLatency ? expectedLatency.latency : null;
-    var highLatency = audioLatency > 20;
+
+    // only compute high latency if the value is known. Also don't accept insanely largue values
+    var highLatency = false;
+    if(audioLatency) {
+      highLatency = audioLatency > 20 && audioLatency < 1000;
+    }
+
     var networkScore = context.jamClient.GetNetworkTestScore();
     var badNetworkScore = networkScore < 2;