diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3d95d70..a1f73cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@ All notable changes to the "vscode-checkstyle" extension will be documented in t
 
 Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
 
-##[1.2.0]
+## [1.2.0]
 ### Added
 - Open the Problems panel when click the status icon in the status bar. ([#176](https://github.com/jdneo/vscode-checkstyle/issues/176))
 
@@ -104,4 +104,4 @@ Initial release for the new Checkstyle extension, the new extension contains fol
 - Add setting ```checkstyle.autocheck```.
 
 ### Fixed
-- Fix the issue that the checkstyle output may not be correctly parsed. 
\ No newline at end of file
+- Fix the issue that the checkstyle output may not be correctly parsed.
diff --git a/src/checkstyleConfigurationManager.ts b/src/checkstyleConfigurationManager.ts
index 37d723a..01038bb 100644
--- a/src/checkstyleConfigurationManager.ts
+++ b/src/checkstyleConfigurationManager.ts
@@ -28,14 +28,19 @@ class CheckstyleConfigurationManager implements vscode.Disposable {
         }
     }
 
-    public get configUri(): vscode.Uri {
-        // Starts with / or X:/ or X:\, where X is a Windows disk drive
-        if (/^([c-zC-Z]:)?[/\\]/.test(this.config.path)) {
+    public get configUri(): vscode.Uri | undefined {
+        if (!this.config.path) {
+            return undefined;
+        } else if (/^([c-zC-Z]:)?[/\\]/.test(this.config.path)) { // Starts with / or X:/ or X:\, where X is a Windows disk drive
             return vscode.Uri.file(this.config.path);
         } else {
             return vscode.Uri.parse(this.config.path);
         }
     }
+    public get isConfigFromLocalFs(): boolean {
+        return !!(this.configUri && this.configUri.scheme === 'file'
+            && !Object.values(BuiltinConfiguration).includes(this.config.path));
+    }
 
     public onDidChangeConfiguration(e: vscode.ConfigurationChangeEvent): void {
         if (e.affectsConfiguration('java.checkstyle.configuration') ||
@@ -54,7 +59,7 @@ class CheckstyleConfigurationManager implements vscode.Disposable {
             this.configWatcher.close();
             this.configWatcher = undefined;
         }
-        if (this.configUri.scheme === 'file' && !Object.values(BuiltinConfiguration).includes(this.config.path)) {
+        if (this.isConfigFromLocalFs) {
             this.configWatcher = chokidar.watch(this.config.path);
             this.configWatcher.on('all', (_event: string) => { this.syncServer(); });
         }
diff --git a/src/commands/config.ts b/src/commands/config.ts
index fde3b7a..2dabb26 100644
--- a/src/commands/config.ts
+++ b/src/commands/config.ts
@@ -44,7 +44,7 @@ async function queryForConfiguration(): Promise<string | undefined> {
         },
         {
             label: '$(link) Use URL...',
-            detail: 'Use a Checkstyle file accessible via HTTP.',
+            detail: 'Use a Checkstyle configuration accessible via HTTP.',
             value: ':input',
         },
         {
@@ -81,7 +81,7 @@ async function browseForConfiguration(): Promise<string | undefined> {
 
 async function inputConfiguration(): Promise<string | undefined> {
     const configPath: string | undefined = await window.showInputBox({
-        prompt: 'Enter configuration path here.',
+        prompt: 'Enter configuration URL here.',
         placeHolder: 'Supports http(s)://...',
         value: 'https://',
         ignoreFocusOut: true,