From 0504410ee968119f73681c0f0c4af786a36ee5c5 Mon Sep 17 00:00:00 2001
From: Yuri Kuznetsov <yurikuzn@users.noreply.github.com>
Date: Tue, 5 Mar 2024 10:06:38 +0200
Subject: [PATCH] fix type check

---
 .../Core/Authentication/Jwt/SignatureVerifiers/Rsa.php    | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/application/Espo/Core/Authentication/Jwt/SignatureVerifiers/Rsa.php b/application/Espo/Core/Authentication/Jwt/SignatureVerifiers/Rsa.php
index 1dfb68e3d9..ea89c4101b 100644
--- a/application/Espo/Core/Authentication/Jwt/SignatureVerifiers/Rsa.php
+++ b/application/Espo/Core/Authentication/Jwt/SignatureVerifiers/Rsa.php
@@ -120,6 +120,12 @@ class Rsa implements SignatureVerifier
             'e' => new BigInteger('0x' . bin2hex(Util::base64UrlDecode($key->getE())), 16),
         ]);
 
-        return $publicKey->toString('PKCS8');
+        $pem = $publicKey->toString('PKCS8');
+
+        if (!is_string($pem)) {
+            throw new RuntimeException();
+        }
+
+        return $pem;
     }
 }