diff --git a/src/plugins/editor-monaco-language-apidom/language/monaco.contribution.js b/src/plugins/editor-monaco-language-apidom/language/monaco.contribution.js
index f5ed1700095..d5d915d44ec 100644
--- a/src/plugins/editor-monaco-language-apidom/language/monaco.contribution.js
+++ b/src/plugins/editor-monaco-language-apidom/language/monaco.contribution.js
@@ -67,6 +67,7 @@ export const isLanguageRegistered = () => {
 
 const lazyMonacoContribution = ({ createData, system }) => {
   const disposables = [];
+  const extensionsInitialized = initializeExtensions();
 
   // register apidom language
   disposables.push(
@@ -80,9 +81,11 @@ const lazyMonacoContribution = ({ createData, system }) => {
       id: apidom.languageId,
     })
   );
-  initializeExtensions().then(() => {
+
+  extensionsInitialized.then(() => {
     disposables.push(vscodeLanguages.setLanguageConfiguration(apidom.languageId, apidom.conf));
   });
+
   disposables.push(monaco.languages.setMonarchTokensProvider(apidom.languageId, apidom.language));
 
   // setup apidom mode
diff --git a/src/plugins/editor-monaco-language-apidom/language/providers/DiagnosticsProvider.js b/src/plugins/editor-monaco-language-apidom/language/providers/DiagnosticsProvider.js
index 68da19009e0..a9645eae693 100644
--- a/src/plugins/editor-monaco-language-apidom/language/providers/DiagnosticsProvider.js
+++ b/src/plugins/editor-monaco-language-apidom/language/providers/DiagnosticsProvider.js
@@ -1,5 +1,6 @@
 import * as monaco from 'monaco-editor';
 import { languages as vscodeLanguages } from 'vscode';
+import { initialize as initializeExtensions } from 'vscode/extensions';
 
 import Provider from './Provider.js';
 import * as apidom from '../apidom.js';
@@ -9,13 +10,11 @@ class DiagnosticsProvider extends Provider {
 
   #disposables = [];
 
-  #diagnosticCollection;
+  #diagnosticCollection = null;
 
   constructor(...args) {
     super(...args);
 
-    this.#diagnosticCollection = vscodeLanguages.createDiagnosticCollection(apidom.languageId);
-
     const onModelAdded = (model) => {
       if (model.getLanguageId() !== apidom.languageId) {
         return;
@@ -62,10 +61,15 @@ class DiagnosticsProvider extends Provider {
       }
     };
 
+    const onExtensionsInitialized = () => {
+      this.#diagnosticCollection = vscodeLanguages.createDiagnosticCollection(apidom.languageId);
+      this.#disposables.push(this.#diagnosticCollection);
+    };
+
     this.#disposables.push(monaco.editor.onDidCreateModel(onModelAdded));
     this.#disposables.push(monaco.editor.onDidChangeModelLanguage(onModelLanguageChanged));
     this.#disposables.push(monaco.editor.onWillDisposeModel(onModelRemoved));
-    this.#disposables.push(this.#diagnosticCollection);
+    initializeExtensions().then(onExtensionsInitialized);
   }
 
   async #getDiagnostics(model) {