Made the preview bar only get created if a video is found.

content.js

@@ -25,10 +25,9 @@ var channelURL;
 var channelWhitelisted = false;
 
 // create preview bar
-let progressBar = document.getElementsByClassName("ytp-progress-bar-container")[0] || document.getElementsByClassName("no-model cue-range-markers")[0];
-var previewBar = new PreviewBar(progressBar);
+var previewBar;
 
-if(id = getYouTubeVideoID(document.URL)){ // Direct Links
+if (id = getYouTubeVideoID(document.URL)) { // Direct Links
   videoIDChange(id);
 }
 
@@ -203,10 +202,15 @@ document.onkeydown = function(e){
 }
 
 function videoIDChange(id) {
-
   //not a url change
   if (sponsorVideoID == id) return;
 
+  if (previewBar == null) {
+    //create it
+    let progressBar = document.getElementsByClassName("ytp-progress-bar-container")[0] || document.getElementsByClassName("no-model cue-range-markers")[0];
+    previewBar = new PreviewBar(progressBar);
+  }
+
   //warn them if they had unsubmitted times
   if (previousVideoID != null) {
     //get the sponsor times from storage

manifest.json

@@ -1,7 +1,7 @@
 {
   "name": "SponsorBlock for YouTube - Skip Sponsorships",
   "short_name": "SponsorBlock",
-  "version": "1.0.35",
+  "version": "1.0.36",
   "description": "Skip over sponsorship on YouTube videos. Report sponsors on videos you watch to save the time of others.",
   "content_scripts": [
     {