diff --git a/extensions/php/src/features/validationProvider.ts b/extensions/php/src/features/validationProvider.ts
index d02352898d2..a49821d6991 100644
--- a/extensions/php/src/features/validationProvider.ts
+++ b/extensions/php/src/features/validationProvider.ts
@@ -121,6 +121,10 @@ 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 {
@@ -293,4 +297,4 @@ export default class PHPValidationProvider {
 		}
 		vscode.window.showInformationMessage(message);
 	}
-}
\ No newline at end of file
+}