8aab2eef34ec26b85186b0a274d6dad2b0a99ff5
max
  Tue May 6 06:17:54 2025 -0700
improving js error message, refs #26554

diff --git src/hg/js/hgTracks.js src/hg/js/hgTracks.js
index 145ee8edd63..c30ab8b4dee 100644
--- src/hg/js/hgTracks.js
+++ src/hg/js/hgTracks.js
@@ -4463,31 +4463,31 @@
         // this.cmd can be used to figure out which menu item triggered this.
         // this.id === appropriate track if we are retrieving just a single track.
 
         // update local hgTracks.trackDb to reflect possible side-effects of ajax request.
 
         var newJson = scrapeVariable(response, "hgTracks");
 
         //alert(JSON.stringify(newJson)); // DEBUG Example
 
         var oldJson = hgTracks;
         var valid = false;
         var stripped = {};
         if (!newJson) {
             stripJsEmbedded(response, true, stripped);
             if ( ! stripped.warnMsg )
-                warn("hgTracks object is missing from the response");
+                warn("An unexpected error has occurred. Please consider letting us know by emailing genome-www@soe.ucsc.edu with the steps you took that resulted in this state and any info on how we can reproduce it. For that, consider creating a session via My Data > My Sessions.");
         } else {
             if (this.id) {
                 if (newJson.trackDb[this.id]) {
                     var visibility = vis.enumOrder[newJson.trackDb[this.id].visibility];
                     var limitedVis;
                     if (newJson.trackDb[this.id].limitedVis)
                         limitedVis = vis.enumOrder[newJson.trackDb[this.id].limitedVis];
                     if (this.newVisibility && limitedVis && this.newVisibility !== limitedVis)
                         // see redmine 1333#note-9
                         alert("There are too many items to display the track in " +
                                 this.newVisibility + " mode.");
                     var rec = oldJson.trackDb[this.id];
                     rec.limitedVis = newJson.trackDb[this.id].limitedVis;
                     rec.imgOffsetY = newJson.trackDb[this.id].imgOffsetY;
                     vis.update(this.id, visibility);