From a495427c5c18d0fcafaa5872343fc22130160caf Mon Sep 17 00:00:00 2001
From: itsmattkc <itsmattkc@gmail.com>
Date: Wed, 24 Feb 2021 22:16:27 +1100
Subject: [PATCH] fixed crash with non-sequence viewers

---
 app/project/item/sequence/sequence.cpp | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/app/project/item/sequence/sequence.cpp b/app/project/item/sequence/sequence.cpp
index e4bfef689..d39c08e75 100644
--- a/app/project/item/sequence/sequence.cpp
+++ b/app/project/item/sequence/sequence.cpp
@@ -228,16 +228,18 @@ void Sequence::Retranslate()
 
 rational Sequence::GetCustomLength(Track::Type type) const
 {
-  switch (type) {
-  case Track::kVideo:
-    return track_lists_.at(Track::kVideo)->GetTotalLength();
-  case Track::kAudio:
-    return track_lists_.at(Track::kAudio)->GetTotalLength();
-  case Track::kSubtitle:
-    return track_lists_.at(Track::kSubtitle)->GetTotalLength();
-  case Track::kNone:
-  case Track::kCount:
-    break;
+  if (!track_lists_.isEmpty()) {
+    switch (type) {
+    case Track::kVideo:
+      return track_lists_.at(Track::kVideo)->GetTotalLength();
+    case Track::kAudio:
+      return track_lists_.at(Track::kAudio)->GetTotalLength();
+    case Track::kSubtitle:
+      return track_lists_.at(Track::kSubtitle)->GetTotalLength();
+    case Track::kNone:
+    case Track::kCount:
+      break;
+    }
   }
 
   return rational();