From 08548b38a4e857031b18deb693b09af05ee93d3d Mon Sep 17 00:00:00 2001
From: shun-iwasawa <shun.iwasawa@ghibli.jp>
Date: Aug 24 2022 02:17:23 +0000
Subject: fix crash on replacing level:


---

diff --git a/toonz/sources/toonz/levelsettingspopup.cpp b/toonz/sources/toonz/levelsettingspopup.cpp
index e222b8e..87ef32e 100644
--- a/toonz/sources/toonz/levelsettingspopup.cpp
+++ b/toonz/sources/toonz/levelsettingspopup.cpp
@@ -747,7 +747,7 @@ LevelSettingsValues LevelSettingsPopup::getValues(TXshLevelP level) {
       values.doAntialias = (sl->getProperties()->antialiasSoftness() > 0)
                                ? Qt::Checked
                                : Qt::Unchecked;
-      values.softness = sl->getProperties()->antialiasSoftness();
+      values.softness    = sl->getProperties()->antialiasSoftness();
     }
   }
 
@@ -1438,6 +1438,7 @@ void LevelSettingsPopup::onSubsamplingChanged() {
     return;
   }
 
+  bool somethingChanged = false;
   TUndoManager::manager()->beginBlock();
   QSetIterator<TXshLevelP> levelItr(m_selectedLevels);
   while (levelItr.hasNext()) {
@@ -1454,8 +1455,10 @@ void LevelSettingsPopup::onSubsamplingChanged() {
     TUndoManager::manager()->add(new LevelSettingsUndo(
         levelP.getPointer(), LevelSettingsUndo::Subsampling, oldSubsampling,
         subsampling));
+    somethingChanged = true;
   }
   TUndoManager::manager()->endBlock();
+  if (!somethingChanged) return;
 
   TApp::instance()->getCurrentScene()->setDirtyFlag(true);
   TApp::instance()
diff --git a/toonz/sources/toonz/previewfxmanager.cpp b/toonz/sources/toonz/previewfxmanager.cpp
index ccffbfb..169204a 100644
--- a/toonz/sources/toonz/previewfxmanager.cpp
+++ b/toonz/sources/toonz/previewfxmanager.cpp
@@ -1456,6 +1456,7 @@ void PreviewFxManager::onLevelChanged() {
     // Build the level name as an alias keyword. All cache images associated
     // with an alias containing the level name will be updated.
     TXshLevel *xl = TApp::instance()->getCurrentLevel()->getLevel();
+    if (!xl) return;
     std::string aliasKeyword;
     TFilePath fp = xl->getPath();
     aliasKeyword = ::to_string(fp.withType(""));