From 70ff2d0ec25793b801ccbb80a622e2ed44377f9a Mon Sep 17 00:00:00 2001
From: jeefo <jeefo@rwsh.ru>
Date: Sun, 7 May 2023 21:28:24 +0300
Subject: [PATCH] fix: possible crash with vistable rebuild (ref #443)

---
 src/vistable.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/vistable.cpp b/src/vistable.cpp
index f6804f2..47840bf 100644
--- a/src/vistable.cpp
+++ b/src/vistable.cpp
@@ -14,6 +14,11 @@ void GraphVistable::rebuild () {
    }
    m_length = graph.length ();
 
+   // stop generation if graph has changed, or erased
+   if (!m_length || graph.hasChanged ()) {
+      m_rebuild = false;
+      return;
+   }
    TraceResult tr {};
    uint8_t res, shift;