From eb2a7eef68c3fe2c425ff323d4d965e80282b1eb Mon Sep 17 00:00:00 2001
From: Rob Lourens <roblourens@gmail.com>
Date: Mon, 7 Mar 2022 16:31:14 -0800
Subject: [PATCH] Fix #144556

---
 .../php-language-features/src/features/validationProvider.ts  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/extensions/php-language-features/src/features/validationProvider.ts b/extensions/php-language-features/src/features/validationProvider.ts
index bc8b7d25966..6a494b3231a 100644
--- a/extensions/php-language-features/src/features/validationProvider.ts
+++ b/extensions/php-language-features/src/features/validationProvider.ts
@@ -112,7 +112,9 @@ export default class PHPValidationProvider {
 		vscode.workspace.onDidOpenTextDocument(this.triggerValidate, this, subscriptions);
 		vscode.workspace.onDidCloseTextDocument((textDocument) => {
 			this.diagnosticCollection!.delete(textDocument.uri);
-			delete this.delayers![textDocument.uri.toString()];
+			if (this.delayers) {
+				delete this.delayers[textDocument.uri.toString()];
+			}
 		}, null, subscriptions);
 	}