diff --git a/CHANGELOG.md b/CHANGELOG.md
index 33c43fa5..ddf930f8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 
 - [#646](https://github.com/estruyf/vscode-front-matter/issues/646): Update the Astro `3000` port to `4321`
 - [#647](https://github.com/estruyf/vscode-front-matter/issues/647): Fix the open in browser action on the preview
+- [#648](https://github.com/estruyf/vscode-front-matter/issues/648): Fix the global configuration reference to the URL of the schema file
 
 ## [9.1.0] - 2023-08-31
 
diff --git a/package.json b/package.json
index 5885fe44..efede6e8 100644
--- a/package.json
+++ b/package.json
@@ -95,7 +95,6 @@
       }]
     },
     "configuration": {
-      "$id": "#globalconfiguration",
       "title": "%settings.configuration.title%",
       "type": "object",
       "properties": {
@@ -115,7 +114,7 @@
                 "markdownDescription": "%setting.frontMatter.projects.items.properties.default.markdownDescription%"
               },
               "configuration": {
-                "$ref": "#globalconfiguration"
+                "$ref": "https://frontmatter.codes/frontmatter.schema.json"
               }
             }
           }
diff --git a/src/commands/Folders.ts b/src/commands/Folders.ts
index 08ba1b0d..f125ead1 100644
--- a/src/commands/Folders.ts
+++ b/src/commands/Folders.ts
@@ -495,6 +495,10 @@ export class Folders {
   public static async getContentFolders() {
     // Find folders that contain files
     const wsFolder = Folders.getWorkspaceFolder();
+    if (!wsFolder) {
+      return [];
+    }
+
     const supportedFiles =
       Settings.get<string[]>(SETTING_CONTENT_SUPPORTED_FILETYPES) || DEFAULT_FILE_TYPES;
     const patterns = supportedFiles.map(