Fix for the issue #1076

diff --git a/src/Model/Model_Document.cpp b/src/Model/Model_Document.cpp
index c6e15c7ef3965458559967b83cde2af2ee99f288..f767f340ed5e330b7e1e358ca2251c1935d1622f 100755 (executable)
--- a/src/Model/Model_Document.cpp
+++ b/src/Model/Model_Document.cpp
@@ -634,6 +634,8 @@ bool Model_Document::canUndo()
 
 void Model_Document::undoInternal(const bool theWithSubs, const bool theSynchronize)
 {
+  if (myTransactions.empty())
+    return;
   int aNumTransactions = myTransactions.rbegin()->myOCAFNum;
   myRedos.push_back(*myTransactions.rbegin());
   myTransactions.pop_back();