diff --git a/src/core/link.go b/src/core/link.go
index 1ead4e32..2eb480d2 100644
--- a/src/core/link.go
+++ b/src/core/link.go
@@ -108,7 +108,9 @@ func (l *links) shutdown() {
 			_ = listener.listener.Close()
 		}
 		for _, link := range l._links {
-			_ = link._conn.Close()
+			if link._conn != nil {
+				_ = link._conn.Close()
+			}
 		}
 	})
 }