diff --git a/extensions/php/src/features/validationProvider.ts b/extensions/php/src/features/validationProvider.ts
index 3e4d3714578..55d8c2b056b 100644
--- a/extensions/php/src/features/validationProvider.ts
+++ b/extensions/php/src/features/validationProvider.ts
@@ -120,6 +120,10 @@ export default class PHPValidationProvider {
 	public dispose(): void {
 		this.diagnosticCollection.clear();
 		this.diagnosticCollection.dispose();
+		if (this.documentListener) {
+			this.documentListener.dispose();
+			this.documentListener = null;
+		}
 	}
 
 	private loadConfiguration(): void {
@@ -289,4 +293,4 @@ export default class PHPValidationProvider {
 		}
 		vscode.window.showInformationMessage(message);
 	}
-}
\ No newline at end of file
+}