From 5d2d5441090c0621a7288735027af93f8e616899 Mon Sep 17 00:00:00 2001
From: Krystine Sherwin <93062060+KrystalDelusion@users.noreply.github.com>
Date: Wed, 15 Oct 2025 09:38:43 +1300
Subject: [PATCH] hierarchy.cc: Don't segfault

---
 passes/hierarchy/hierarchy.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/passes/hierarchy/hierarchy.cc b/passes/hierarchy/hierarchy.cc
index c0e6a9104..bfdb80459 100644
--- a/passes/hierarchy/hierarchy.cc
+++ b/passes/hierarchy/hierarchy.cc
@@ -302,7 +302,9 @@ struct IFExpander
 		const auto &bits = conn_signals;
 		if (
 			bits.size() != 1 ||
+			bits[0].wire == nullptr ||
 			!bits[0].wire->get_bool_attribute(ID::is_interface) ||
+			conn_signals[0].wire == nullptr ||
 			conn_signals[0].wire->name.str().find("$dummywireforinterface") != 0
 		)
 			return;