2 files changed, 6 insertions, 5 deletions
diff --git a/muse2/muse/part.cpp b/muse2/muse/part.cpp
index 9b869567..c46e7ab9 100644
--- a/muse2/muse/part.cpp
+++ b/muse2/muse/part.cpp
@@ -81,10 +81,11 @@ void Part::chainClone(Part* p)
 
 void Part::rechainClone()
 {
-    assert(_backupClone);
-    
-    this->chainClone(_backupClone);
-    _backupClone = NULL;
+    if(_backupClone)
+    {
+        this->chainClone(_backupClone);
+        _backupClone = NULL;
+    }
 }
 
 bool Part::isCloneOf(const Part* other) const
diff --git a/muse2/muse/undo.cpp b/muse2/muse/undo.cpp
index 3d2804c6..b5ee3cec 100644
--- a/muse2/muse/undo.cpp
+++ b/muse2/muse/undo.cpp
@@ -623,7 +623,7 @@ UndoOp::UndoOp(UndoType type_, const Part* part_, unsigned old_len_or_tick, unsi
 UndoOp::UndoOp(UndoType type_, const Part* part_, bool selected_, bool sel_old_)
 {
     assert(type_==SelectPart);
-    assert(part);
+    assert(part_);
     
     type=type_;
     part = part_;