From 64ce6e25e5352cda0485e692d8636d7844528b9c Mon Sep 17 00:00:00 2001
From: Rodney <rodney.baker@gmail.com>
Date: Feb 10 2022 09:44:41 +0000
Subject: Merge pull request #4252 from shun-iwasawa/fix_crash_on_undoing_tool


Fix crash on undoing tool
---

diff --git a/toonz/sources/include/tools/toolutils.h b/toonz/sources/include/tools/toolutils.h
index 9dc2736..9bccc00 100644
--- a/toonz/sources/include/tools/toolutils.h
+++ b/toonz/sources/include/tools/toolutils.h
@@ -182,6 +182,8 @@ public:
         .arg(QString::fromStdWString(m_level->getName()))
         .arg(QString::number(m_frameId.getNumber()));
   }
+
+  void onAdd() override;
 };
 
 //================================================================================================
diff --git a/toonz/sources/tnztools/toolutils.cpp b/toonz/sources/tnztools/toolutils.cpp
index 6038269..b562ba8 100644
--- a/toonz/sources/tnztools/toolutils.cpp
+++ b/toonz/sources/tnztools/toolutils.cpp
@@ -603,6 +603,17 @@ void ToolUtils::TToolUndo::notifyImageChanged() const {
   }
 }
 
+//------------------------------------------------------------------------------------------
+
+void ToolUtils::TToolUndo::onAdd() {
+  // clean up the flags after registering undo
+  TTool::m_isLevelCreated     = false;
+  TTool::m_isFrameCreated     = false;
+  TTool::m_isLevelRenumbererd = false;
+}
+
+//------------------------------------------------------------------------------------------
+
 int ToolUtils::TToolUndo::m_idCount = 0;
 
 //================================================================================================