diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
@@ -598,7 +598,7 @@
   m_die_array.clear();
   m_die_array.shrink_to_fit();
 
-  if (m_dwo)
+  if (m_dwo && !m_dwo->m_cancel_scopes)
     m_dwo->ClearDIEsRWLocked();
 }