Index: lldb/trunk/source/Core/RegisterValue.cpp
===================================================================
--- lldb/trunk/source/Core/RegisterValue.cpp
+++ lldb/trunk/source/Core/RegisterValue.cpp
@@ -539,6 +539,9 @@
 }
 
 bool RegisterValue::CopyValue(const RegisterValue &rhs) {
+  if (this == &rhs)
+    return rhs.m_type == eTypeInvalid ? false : true;
+
   m_type = rhs.m_type;
   switch (m_type) {
   case eTypeInvalid:
Index: lldb/trunk/source/Core/Value.cpp
===================================================================
--- lldb/trunk/source/Core/Value.cpp
+++ lldb/trunk/source/Core/Value.cpp
@@ -142,6 +142,9 @@
 }
 
 size_t Value::AppendDataToHostBuffer(const Value &rhs) {
+  if (this == &rhs)
+    return 0;
+
   size_t curr_size = m_data_buffer.GetByteSize();
   Status error;
   switch (rhs.GetValueType()) {