fix(app-home): fix to scroll function when moving to another page

Author: luiskcs89

src/pages/app-home/app-home.tsx

@@ -29,31 +29,33 @@ export class AppHome {
 
     /* tslint:disable-next-line */
     $(window).on('scroll resize', function() {
-      const pos = $('#content-panel-inner').offset().top + $('#content-panel-inner').height() / 2;
-      let done = false;
-      $('.content-panel').each(function() {
-        if (!done && pos <= Math.floor($(this).offset().top + $(this).height())) {
-          const newDescr = $(this)
+      if ($('#content-panel-inner') && $('#content-panel-inner').offset()) {
+        const pos = $('#content-panel-inner').offset().top + $('#content-panel-inner').height() / 2;
+        let done = false;
+        $('.content-panel').each(function() {
+          if (!done && pos <= Math.floor($(this).offset().top + $(this).height())) {
+            const newDescr = $(this)
+              .find('.description')
+              .html();
+            $('#content-panel-inner').html(newDescr);
+
+            done = true;
+          }
+        });
+
+        if (
+          $('#content-panel-inner').offset().top ===
+          $('.content-panel')
+            .first()
+            .offset().top
+        ) {
+          const newDescr = $('.content-panel')
+            .first()
             .find('.description')
             .html();
-          $('#content-panel-inner').html(newDescr);
 
-          done = true;
+          $('#content-panel-inner').html(newDescr);
         }
-      });
-
-      if (
-        $('#content-panel-inner').offset().top ===
-        $('.content-panel')
-          .first()
-          .offset().top
-      ) {
-        const newDescr = $('.content-panel')
-          .first()
-          .find('.description')
-          .html();
-
-        $('#content-panel-inner').html(newDescr);
       }
     });