diff --git a/packages/core/src/canvas/index.ts b/packages/core/src/canvas/index.ts
index 88940b85b..3e4aca716 100644
--- a/packages/core/src/canvas/index.ts
+++ b/packages/core/src/canvas/index.ts
@@ -486,7 +486,9 @@ export default class CanvasModule extends Module<CanvasConfig> {
    */
   getMouseRelativePos(e: any, opts: any = {}) {
     const subWinOffset = opts.subWinOffset;
-    const doc = e.target.ownerDocument;
+    const { target } = e;
+    // In Firefox, pointing outside the window, will return the HTMLDocument.
+    const doc = target.nodeType === Node.DOCUMENT_NODE ? target : target.ownerDocument;
     const win = doc.defaultView || doc.parentWindow;
     const frame = win.frameElement;
     const yOffset = subWinOffset ? win.pageYOffset : 0;
diff --git a/packages/core/src/commands/view/SelectComponent.ts b/packages/core/src/commands/view/SelectComponent.ts
index 0c4b29285..608097350 100644
--- a/packages/core/src/commands/view/SelectComponent.ts
+++ b/packages/core/src/commands/view/SelectComponent.ts
@@ -496,7 +496,7 @@ export default {
           const style: any = {};
 
           if (!onlyHeight) {
-            const bodyw = canvas.getBody().offsetWidth;
+            const bodyw = canvas.getBody()?.offsetWidth || 0;
             const width = rect.w < bodyw ? rect.w : bodyw;
             style[keyWidth!] = autoWidth ? 'auto' : `${width}${unitWidth}`;
           }
diff --git a/packages/core/src/editor/model/Editor.ts b/packages/core/src/editor/model/Editor.ts
index 37e70767a..13471b626 100644
--- a/packages/core/src/editor/model/Editor.ts
+++ b/packages/core/src/editor/model/Editor.ts
@@ -314,6 +314,14 @@ export default class EditorModel extends Model {
     return this.config.grapesjs?.version || '';
   }
 
+  get isHeadless() {
+    return !!this.config.headless;
+  }
+
+  get isShallow() {
+    return !!this.get('isShallow');
+  }
+
   /**
    * Get configurations
    * @param  {string} [prop] Property name
diff --git a/packages/core/src/keymaps/index.ts b/packages/core/src/keymaps/index.ts
index ce0b0659f..015462dda 100644
--- a/packages/core/src/keymaps/index.ts
+++ b/packages/core/src/keymaps/index.ts
@@ -64,6 +64,7 @@ export default class KeymapsModule extends Module<KeymapsConfig & { name?: strin
   }
 
   onLoad() {
+    if (this.em.isHeadless) return;
     const defKeys = this.config.defaults;
 
     for (let id in defKeys) {
@@ -121,7 +122,7 @@ export default class KeymapsModule extends Module<KeymapsConfig & { name?: strin
         const handlerRes = isString(handler) ? cmd.get(handler) : handler;
         const ableTorun = !em.isEditing() && !editor.Canvas.isInputFocused();
         if (ableTorun || opts.force) {
-          opts.prevent && canvas.getCanvasView().preventDefault(e);
+          opts.prevent && canvas.getCanvasView()?.preventDefault(e);
           isFunction(handlerRes) ? handlerRes(editor, 0, opt) : cmd.runCommand(handlerRes, opt);
           const args = [id, h.shortcut, e];
           em.trigger('keymap:emit', ...args);
diff --git a/packages/core/src/utils/sorter/ComponentSorter.ts b/packages/core/src/utils/sorter/ComponentSorter.ts
index c5f05185f..d286390d5 100644
--- a/packages/core/src/utils/sorter/ComponentSorter.ts
+++ b/packages/core/src/utils/sorter/ComponentSorter.ts
@@ -182,7 +182,7 @@ export default class ComponentSorter<NodeType extends BaseComponentNode> extends
       }
     }
     const addedNode = targetNode.addChildAt(sourceNode, index, { action: 'move-component' }) as NodeType;
-    this.triggerEndMoveEvent(addedNode);
+    addedNode && this.triggerEndMoveEvent(addedNode);
 
     return { addedNode, index };
   }