diff --git a/packages/ckeditor5/src/plugins.ts b/packages/ckeditor5/src/plugins.ts
index abf51f086..f96e444ee 100644
--- a/packages/ckeditor5/src/plugins.ts
+++ b/packages/ckeditor5/src/plugins.ts
@@ -31,6 +31,7 @@ import CodeBlockLanguageDropdown from "./plugins/code_block_language_dropdown.js
 import MoveBlockUpDownPlugin from "./plugins/move_block_updown.js";
 import ScrollOnUndoRedoPlugin from "./plugins/scroll_on_undo_redo.js"
 import InlineCodeNoSpellcheck from "./plugins/inline_code_no_spellcheck.js";
+import DisableMentionInCodeBlock from "./plugins/disable_mention_in_codeblock.js";
 
 /**
  * Plugins that are specific to Trilium and not part of the CKEditor 5 core, included in both text editors but not in the attribute editor.
@@ -53,6 +54,7 @@ const TRILIUM_PLUGINS: typeof Plugin[] = [
     MoveBlockUpDownPlugin,
     ScrollOnUndoRedoPlugin,
     InlineCodeNoSpellcheck,
+    DisableMentionInCodeBlock,
 ];
 
 /**
diff --git a/packages/ckeditor5/src/plugins/disable_mention_in_codeblock.ts b/packages/ckeditor5/src/plugins/disable_mention_in_codeblock.ts
new file mode 100644
index 000000000..9407ba6f7
--- /dev/null
+++ b/packages/ckeditor5/src/plugins/disable_mention_in_codeblock.ts
@@ -0,0 +1,23 @@
+import { Plugin } from "ckeditor5";
+
+/**
+ * Disables the mention feature (triggered by `@`) inside code blocks.
+ * This prevents the autocomplete popup from appearing when typing `@` within code blocks.
+ */
+export default class DisableMentionInCodeBlock extends Plugin {
+    public static get pluginName() {
+        return "DisableMentionInCodeBlock" as const;
+    }
+
+    init() {
+        const editor = this.editor;
+        const schema = editor.model.schema;
+
+        // Disallow mention attribute inside code blocks
+        schema.addAttributeCheck((context, attributeName) => {
+            if (attributeName === 'mention' && context.endsWith('codeBlock $text')) {
+                return false;
+            }
+        });
+    }
+}