diff -urN zabbix-7.0.22.orig/src/go/vendor/golang.zabbix.com/sdk/tlsconfig/tlsconfig.go zabbix-7.0.22/src/go/vendor/golang.zabbix.com/sdk/tlsconfig/tlsconfig.go
--- zabbix-7.0.22.orig/src/go/vendor/golang.zabbix.com/sdk/tlsconfig/tlsconfig.go	2025-12-17 04:11:46.216734002 +0900
+++ zabbix-7.0.22/src/go/vendor/golang.zabbix.com/sdk/tlsconfig/tlsconfig.go	2026-02-08 19:18:19.324402433 +0900
@@ -94,12 +94,13 @@
 
 	clientCerts := make([]tls.Certificate, 0, 1)
 
-	certs, err := tls.LoadX509KeyPair(details.TLSCertFile, details.TLSKeyFile)
-	if err != nil {
-		return nil, errs.Wrap(err, "failed to load key pair")
-	}
-
-	clientCerts = append(clientCerts, certs)
+  if details.TLSCertFile != "" && details.TLSKeyFile != "" {
+    certs, err := tls.LoadX509KeyPair(details.TLSCertFile, details.TLSKeyFile)
+    if err != nil {
+      return nil, errs.Wrap(err, "failed to load key pair")
+    }
+    clientCerts = append(clientCerts, certs)
+  }
 
 	if skipVerify {
 		//nolint:gosec