diff --git a/src/hb-common.cc b/src/hb-common.cc
index 0720237..08ec04e 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -381,7 +381,8 @@
 const char *
 hb_language_to_string (hb_language_t language)
 {
-  /* This is actually nullptr-safe! */
+  if (!language) return nullptr;
+
   return language->s;
 }