CtSaving crashes at high speed

We get a segmentation fault when saving HDF5 at high speed with PSI/Eiger-500k:

(gdb) frame 4
#4  lima::CtSaving::_getTaskList (this=this@entry=0x55d8b8b88e00, type=type@entry=lima::CtSaving::Save, frame_nr=7001, header=..., task_list=...)
    at /users/blissadm/local/lima.git/control/src/CtSaving.cpp:1233
1233		m_nb_cbk.insert(map_pair);
(gdb) list
1228			}
1229		}
1230		size_t nb_cbk = task_list.size();
1231		DEB_TRACE() << DEB_VAR1(nb_cbk);
1232		FrameCbkCountMap::value_type map_pair(frame_nr, long(nb_cbk));
1233		m_nb_cbk.insert(map_pair);
1234	}