diff --git a/src/backend/utils/adt/ddlutils.c b/src/backend/utils/adt/ddlutils.c
index d83cda33..cc7511e8 100644
--- a/src/backend/utils/adt/ddlutils.c
+++ b/src/backend/utils/adt/ddlutils.c
@@ -986,7 +986,8 @@ pg_get_database_ddl_internal(Oid dbid, bool pretty,
 	{
 		char	   *spcname = get_tablespace_name(dbform->dattablespace);
 
-		if (pg_strcasecmp(spcname, "pg_default") != 0)
+		if (spcname != NULL &&
+			pg_strcasecmp(spcname, "pg_default") != 0)
 			append_ddl_option(&buf, pretty, 4, "TABLESPACE = %s",
 							  quote_identifier(spcname));
 	}