fix(nat): panic on nil endpoint

helper/data.go

@@ -1,6 +1,7 @@
 package helper
 
 import (
+	"reflect"
 	"unsafe"
 )
 
@@ -30,3 +31,11 @@ func StringToBytes(s string) (b []byte) {
 	bh.cap = sh.len
 	return b
 }
+
+func IsNilInterface(x any) bool {
+	return x == nil || reflect.ValueOf(x).IsZero()
+}
+
+func IsNonNilInterface(x any) bool {
+	return !IsNilInterface(x)
+}