diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 8274f50f..d2e16763 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -9,6 +9,7 @@
 - `Fix` — When the focusing Block is out of the viewport, the page will be scrolled.
 - `Fix` — `blocks.render()` won't lead the `onChange` call in Safari
 - `Fix` — Editor wrapper element growing on the Inline Toolbar close
+- `Fix` — Fix errors thrown by clicks on a document when the editor is being initialized
 
 ### 2.28.2
 
diff --git a/package.json b/package.json
index 4d87891f..0cfa67ea 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@editorjs/editorjs",
-  "version": "2.29.0-rc.5",
+  "version": "2.29.0-rc.6",
   "description": "Editor.js — Native JS, based on API and Open Source",
   "main": "dist/editorjs.umd.js",
   "module": "dist/editorjs.mjs",
diff --git a/src/components/modules/blockManager.ts b/src/components/modules/blockManager.ts
index 8fe8ff45..7075d30f 100644
--- a/src/components/modules/blockManager.ts
+++ b/src/components/modules/blockManager.ts
@@ -744,7 +744,11 @@ export default class BlockManager extends Module {
    * @param {Node} childNode - node to get Block by
    * @returns {Block}
    */
-  public getBlockByChildNode(childNode: Node): Block {
+  public getBlockByChildNode(childNode: Node): Block | undefined {
+    if (!childNode || childNode instanceof Node === false) {
+      return undefined;
+    }
+
     /**
      * If node is Text TextNode
      */
diff --git a/src/components/modules/crossBlockSelection.ts b/src/components/modules/crossBlockSelection.ts
index fc0c40c9..33da99c8 100644
--- a/src/components/modules/crossBlockSelection.ts
+++ b/src/components/modules/crossBlockSelection.ts
@@ -187,6 +187,13 @@ export default class CrossBlockSelection extends Module {
   private onMouseOver = (event: MouseEvent): void => {
     const { BlockManager, BlockSelection } = this.Editor;
 
+    /**
+     * Probably, editor is not initialized yet
+     */
+    if (event.relatedTarget === null && event.target === null) {
+      return;
+    }
+
     const relatedBlock = BlockManager.getBlockByChildNode(event.relatedTarget as Node) || this.lastSelectedBlock;
     const targetBlock = BlockManager.getBlockByChildNode(event.target as Node);
 
diff --git a/src/components/modules/toolbar/blockSettings.ts b/src/components/modules/toolbar/blockSettings.ts
index e7c53114..4cc1db52 100644
--- a/src/components/modules/toolbar/blockSettings.ts
+++ b/src/components/modules/toolbar/blockSettings.ts
@@ -13,7 +13,10 @@ import Popover, { PopoverEvent } from '../../utils/popover';
  * HTML Elements that used for BlockSettings
  */
 interface BlockSettingsNodes {
-  wrapper: HTMLElement;
+  /**
+   * Block Settings wrapper. Undefined when before "make" method called
+   */
+  wrapper: HTMLElement | undefined;
 }
 
 /**
diff --git a/src/components/modules/toolbar/index.ts b/src/components/modules/toolbar/index.ts
index 575a8786..4d4f656c 100644
--- a/src/components/modules/toolbar/index.ts
+++ b/src/components/modules/toolbar/index.ts
@@ -32,12 +32,12 @@ import { BlockHovered } from '../../events/BlockHovered';
  * HTML Elements used for Toolbar UI
  */
 interface ToolbarNodes {
-  wrapper: HTMLElement;
-  content: HTMLElement;
-  actions: HTMLElement;
+  wrapper: HTMLElement | undefined;
+  content: HTMLElement | undefined;
+  actions: HTMLElement | undefined;
 
-  plusButton: HTMLElement;
-  settingsToggler: HTMLElement;
+  plusButton: HTMLElement | undefined;
+  settingsToggler: HTMLElement | undefined;
 }
 /**
  *
@@ -316,7 +316,7 @@ export default class Toolbar extends Module<ToolbarNodes> {
       return;
     }
 
-    this.nodes.wrapper.classList.remove(this.CSS.toolbarOpened);
+    this.nodes.wrapper?.classList.remove(this.CSS.toolbarOpened);
 
     /** Close components */
     this.blockActions.hide();
diff --git a/src/components/modules/toolbar/inline.ts b/src/components/modules/toolbar/inline.ts
index 03294ed8..81b4b25d 100644
--- a/src/components/modules/toolbar/inline.ts
+++ b/src/components/modules/toolbar/inline.ts
@@ -17,16 +17,16 @@ import { IconChevronDown } from '@codexteam/icons';
  * Inline Toolbar elements
  */
 interface InlineToolbarNodes {
-  wrapper: HTMLElement;
-  togglerAndButtonsWrapper: HTMLElement;
-  buttons: HTMLElement;
-  conversionToggler: HTMLElement;
-  conversionTogglerContent: HTMLElement;
+  wrapper: HTMLElement | undefined;
+  togglerAndButtonsWrapper: HTMLElement | undefined;
+  buttons: HTMLElement | undefined;
+  conversionToggler: HTMLElement | undefined;
+  conversionTogglerContent: HTMLElement | undefined;
   /**
    * Zone below the buttons where Tools can create additional actions by 'renderActions()' method
    * For example, input for the 'link' tool or textarea for the 'comment' tool
    */
-  actions: HTMLElement;
+  actions: HTMLElement | undefined;
 }
 
 /**
@@ -238,6 +238,10 @@ export default class InlineToolbar extends Module<InlineToolbarNodes> {
    * @param {Node} node — node to check
    */
   public containsNode(node: Node): boolean {
+    if (this.nodes.wrapper === undefined) {
+      return false;
+    }
+
     return this.nodes.wrapper.contains(node);
   }
 
diff --git a/src/components/modules/ui.ts b/src/components/modules/ui.ts
index 25b76b0e..296a93e7 100644
--- a/src/components/modules/ui.ts
+++ b/src/components/modules/ui.ts
@@ -150,12 +150,20 @@ export default class UI extends Module<UINodes> {
      */
     if (!readOnlyEnabled) {
       /**
-       * Unbind all events
+       * Postpone events binding to the next tick to make sure all ui elements are ready
        */
-      this.enableModuleBindings();
+      window.requestIdleCallback(() => {
+        /**
+         * Bind events for the UI elements
+         */
+        this.enableModuleBindings();
+      }, {
+        timeout: 2000,
+      });
     } else {
       /**
-       * Bind events for the UI elements
+       * Unbind all events
+       *
        */
       this.disableModuleBindings();
     }
@@ -633,8 +641,8 @@ export default class UI extends Module<UINodes> {
      * But allow clicking inside Block Settings.
      * Also, do not process clicks on the Block Settings Toggler, because it has own click listener
      */
-    const isClickedInsideBlockSettings = this.Editor.BlockSettings.nodes.wrapper.contains(target);
-    const isClickedInsideBlockSettingsToggler = this.Editor.Toolbar.nodes.settingsToggler.contains(target);
+    const isClickedInsideBlockSettings = this.Editor.BlockSettings.nodes.wrapper?.contains(target);
+    const isClickedInsideBlockSettingsToggler = this.Editor.Toolbar.nodes.settingsToggler?.contains(target);
     const doNotProcess = isClickedInsideBlockSettings || isClickedInsideBlockSettingsToggler;
 
     if (this.Editor.BlockSettings.opened && !doNotProcess) {