X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/a285f830b66416a81f4c612345db46663509e7e8..4c26bb506b3c12443171551b103a81b038d25334:/config.c

diff --git a/config.c b/config.c
index f44b7603..464a2415 100644
--- a/config.c
+++ b/config.c
@@ -1765,7 +1765,8 @@ void setup_config_box(struct controlbox *b, int midsession,
 		/* We assume the local username is sufficiently stable
 		 * to include on the dialog box. */
 		char *user = get_username();
-		char *userlabel = dupprintf("Use system username (%s)", user);
+		char *userlabel = dupprintf("Use system username (%s)",
+					    user ? user : "");
 		sfree(user);
 		ctrl_radiobuttons(s, "When username is not specified:", 'n', 4,
 				  HELPCTX(connection_username_from_env),