From be72a73082e1e04f4552440eac0caef08bb38970 Mon Sep 17 00:00:00 2001
From: TwinProduction <twin@twinnation.org>
Date: Tue, 17 Nov 2020 12:35:21 -0500
Subject: [PATCH] Fix potential panic

---
 core/service.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/service.go b/core/service.go
index 0a025d8a..b3caa089 100644
--- a/core/service.go
+++ b/core/service.go
@@ -169,7 +169,7 @@ func (service *Service) call(result *Result) {
 			result.Errors = append(result.Errors, err.Error())
 			return
 		}
-		if response.TLS != nil {
+		if response.TLS != nil && len(response.TLS.PeerCertificates) > 0 {
 			certificate := response.TLS.PeerCertificates[0]
 			result.CertificateExpiration = certificate.NotAfter.Sub(time.Now())
 		}