From 3c3543a2a937559917631d59b79b2ec5676fcf9c Mon Sep 17 00:00:00 2001
From: itsmattkc <itsmattkc@gmail.com>
Date: Sat, 21 Mar 2020 13:15:11 +1100
Subject: [PATCH] viewer: avoid divide by zero on sequences with zero length

---
 app/widget/viewer/viewer.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/app/widget/viewer/viewer.cpp b/app/widget/viewer/viewer.cpp
index d2408630b..c517b13a5 100644
--- a/app/widget/viewer/viewer.cpp
+++ b/app/widget/viewer/viewer.cpp
@@ -338,7 +338,12 @@ void ViewerWidget::UpdateMinimumScale()
     return;
   }
 
-  SetMinimumScale(static_cast<double>(ruler()->width()) / GetConnectedNode()->Length().toDouble());
+  if (GetConnectedNode()->Length().isNull()) {
+    // Avoids divide by zero
+    SetMinimumScale(0);
+  } else {
+    SetMinimumScale(static_cast<double>(ruler()->width()) / GetConnectedNode()->Length().toDouble());
+  }
 }
 
 void ViewerWidget::UpdateStack()