From c88868c0e407679de46eb045c1379fb8cdfbf9ed Mon Sep 17 00:00:00 2001
From: Aya Morisawa <AyaMorisawa4869@gmail.com>
Date: Sun, 26 May 2019 22:05:09 +0900
Subject: [PATCH] Fix #4986 (#4991)

---
 src/boot/master.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/boot/master.ts b/src/boot/master.ts
index 503f09c1f..6c23a528f 100644
--- a/src/boot/master.ts
+++ b/src/boot/master.ts
@@ -50,7 +50,7 @@ export async function masterMain() {
 		// initialize app
 		config = await init();
 
-		if (config.port == null) {
+		if (config.port == null || Number.isNaN(config.port)) {
 			bootLogger.error('The port is not configured. Please configure port.', null, true);
 			process.exit(1);
 		}