diff --git a/js/control/TrackAnalysis.js b/js/control/TrackAnalysis.js
index 2f230c9..3a54f89 100644
--- a/js/control/TrackAnalysis.js
+++ b/js/control/TrackAnalysis.js
@@ -470,9 +470,11 @@ BR.TrackAnalysis = L.Class.extend({
                     }
 
                     return typeof parsed.tracktype === 'string' && parsed.tracktype === trackType;
+                } else if (dataName === 'internal-unknown' && typeof parsed.highway !== 'string') {
+                    return true;
                 }
 
-                return parsed.highway === dataName;
+                return typeof parsed.highway === 'string' && parsed.highway === dataName;
             case 'surface':
                 if (dataName === 'internal-unknown' && typeof parsed.surface !== 'string') {
                     return true;