diff --git a/build/lib/extensions.ts b/build/lib/extensions.ts
index 22d87cf6fcd..73ecd83838f 100644
--- a/build/lib/extensions.ts
+++ b/build/lib/extensions.ts
@@ -320,7 +320,11 @@ export function scanBuiltinExtensions(extensionsRoot: string, forWeb: boolean):
 	const scannedExtensions: IScannedBuiltinExtension[] = [];
 	const extensionsFolders = fs.readdirSync(extensionsRoot);
 	for (const extensionFolder of extensionsFolders) {
-		const packageJSON = JSON.parse(fs.readFileSync(path.join(extensionsRoot, extensionFolder, 'package.json')).toString('utf8'));
+		const packageJSONPath = path.join(extensionsRoot, extensionFolder, 'package.json');
+		if (!fs.existsSync(packageJSONPath)) {
+			continue;
+		}
+		const packageJSON = JSON.parse(fs.readFileSync(packageJSONPath).toString('utf8'));
 		const extensionKind: string[] = packageJSON['extensionKind'] || [];
 		if (forWeb && extensionKind.indexOf('web') === -1) {
 			continue;