Crash when starting debugger while there are Expressions

1   Debugger::Internal::DebuggerEngine::state                        debuggerengine.cpp     1039 0x7feb89c9e64 
2   Debugger::Internal::WatchHandler::watchExpression                watchhandler.cpp       2196 0x7feb8a3b4a4 
3   Debugger::Internal::WatchHandler::loadSessionDataForEngine       watchhandler.cpp       2413 0x7feb8a33feb 
4   Debugger::Internal::WatchHandler::WatchHandler                   watchhandler.cpp       1977 0x7feb8a2913f 
5   Debugger::Internal::DebuggerEnginePrivate::DebuggerEnginePrivate debuggerengine.cpp     279  0x7feb89be3d3 
6   Debugger::Internal::DebuggerEngine::DebuggerEngine               debuggerengine.cpp     786  0x7feb89be2a3 
7   Debugger::Internal::GdbEngine::GdbEngine                         gdbengine.cpp          141  0x7feb8a70dbb 
8   Debugger::Internal::createGdbEngine                              gdbengine.cpp          4849 0x7feb8a77bf4 
9   Debugger::DebuggerRunTool::start                                 debuggerruncontrol.cpp 578  0x7feb89fe4ab 
10  QTimer::timeout                                                  Qt5Core                     0x7feb97ea741