Fix errors in JS player

www/video-rtc.js

@@ -392,13 +392,12 @@ export class VideoRTC extends HTMLElement {
             sb.mode = "segments"; // segments or sequence
             sb.addEventListener("updateend", () => {
                 if (sb.updating) return;
-                if (bufLen > 0) {
+
                 try {
-                        sb.appendBuffer(buf.slice(0, bufLen));
-                    } catch (e) {
-                        // console.debug(e);
-                    }
+                    if (bufLen > 0) {
+                        const data = buf.slice(0, bufLen);
                         bufLen = 0;
+                        sb.appendBuffer(data);
                     } else if (sb.buffered && sb.buffered.length) {
                         const end = sb.buffered.end(sb.buffered.length - 1) - 5;
                         const start = sb.buffered.start(0);
@@ -408,6 +407,9 @@ export class VideoRTC extends HTMLElement {
                         }
                         // console.debug("VideoRTC.buffered", start, end);
                     }
+                } catch (e) {
+                    // console.debug(e);
+                }
             });
 
             const buf = new Uint8Array(2 * 1024 * 1024);
@@ -504,6 +506,8 @@ export class VideoRTC extends HTMLElement {
      * @param ev {Event}
      */
     onpcvideo(ev) {
+        if (!this.pc) return;
+
         /** @type {HTMLVideoElement} */
         const video2 = ev.target;
         const state = this.pc.connectionState;