lldb does not work with QtCreator on Mac OS X

After upgrading XCode to 7.3 lldb does not work any more for C++ applications launched from QtCreator. Before XCode 7.3 upgrade it worked just fine.

There are the following errors in debugger console:

ERROR: Lldb stderr: error: cannot delete one or more categories
error: cannot delete one or more categories

ERROR: Lldb stderr: Exception in thread Thread-1:
Traceback (most recent call last):
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 763, in run
self._target(*self.args, **self._kwargs)
File "/Users/alexz/Developer/Qt/Qt Creator.app/Contents/Resources/debugger/lldbbridge.py", line 769, in loop
self.handleEvent(event)
File "/Users/alexz/Developer/Qt/Qt Creator.app/Contents/Resources/debugger/lldbbridge.py", line 1409, in handleEvent
% self.hexencode(msg))
File "/Users/alexz/Developer/Qt/Qt Creator.app/Contents/Resources/debugger/dumper.py", line 479, in hexencode
return s.encode("hex")
AttributeError: 'NoneType' object has no attribute 'encode'