👌 wrap block to check if elem exist before checking for elem.offsetHeight

Author: dbendaou

app/components/ember-anchor.js

@@ -9,9 +9,8 @@ export default AnchorComponent.extend({
     let qp = this.anchorQueryParam;
     let qpVal = this.get(get(this, 'attrs.a') ? 'a' : `controller.${qp}`);
     let elem = document.querySelector(`[data-${qp}="${qpVal}"]`);
-    const offsetTop = elem.offsetHeight;
 
-    if (offsetTop) {
+    if (elem && elem.offsetHeight) {
       const offsetToScroll = getOffset(elem, config.APP.scrollContainerSelector)
       document.querySelector(config.APP.scrollContainerSelector).scrollTo(0, offsetToScroll);
     }

app/mixins/scroll-tracker.js

@@ -16,9 +16,8 @@ export default Mixin.create({
       this._super();
       if ((typeof FastBoot === 'undefined') && window.location.search === '?anchor=' ) {
         let elem = document.querySelector('#methods');
-        let offsetTop = elem.offsetHeight;
 
-        if (offsetTop) {
+        if (elem && elem.offsetHeight) {
           const offsetToScroll = getOffset(elem, config.APP.scrollContainerSelector)
           document.querySelector(config.APP.scrollContainerSelector).scrollTo(0, offsetToScroll - 10);
           return;