Merge pull request #4696 from FlipWarthog/PV4689

Fix #4689 - ScrollPanel: TypeError: Cannot read properties of null (reading 'scrollWidth')

components/lib/scrollpanel/ScrollPanel.vue

@@ -103,6 +103,7 @@ export default {
             }
         },
         moveBar() {
+            if (this.$refs.content) {
                 /* horizontal scroll */
                 let totalWidth = this.$refs.content.scrollWidth;
                 let ownWidth = this.$refs.content.clientWidth;
@@ -136,6 +137,7 @@ export default {
                         this.$refs.yBar.style.cssText = 'height:' + Math.max(this.scrollYRatio * 100, 10) + '%; top: calc(' + (this.$refs.content.scrollTop / totalHeight) * 100 + '% - ' + this.$refs.xBar.clientHeight + 'px);right:' + right + 'px;';
                     }
                 });
+            }
         },
         onYBarMouseDown(e) {
             this.isYBarClicked = true;