fix: filter null node first. (#1909)

Author: Koooooo-7

src/core/render/index.js

@@ -260,7 +260,9 @@ export function Render(Base) {
         [
           document.querySelector('aside.sidebar'),
           document.querySelector('button.sidebar-toggle'),
-        ].forEach(node => node.parentNode.removeChild(node));
+        ]
+          .filter(e => !!e)
+          .forEach(node => node.parentNode.removeChild(node));
         document.querySelector('section.content').style.right = 'unset';
         document.querySelector('section.content').style.left = 'unset';
         document.querySelector('section.content').style.position = 'relative';