unable tu use markers on dev build

[gucio321]

Hi,
When I create a ghraph and try to use markers, it throws a segfault.

Gtk-Message: 09:31:42.045: Failed to load module "atk-bridge"
Debug: huh, wrong size 0 1 
/usr/include/c++/15.2.1/bits/stl_vector.h:1263: std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](size_type) [with _Tp = double; _Alloc = std::allocator<double>; reference = double&; size_type = long unsigned int]: Assertion '__n < this->size()' failed.
Aborted                    (core dumped) qucs

this happens on both: develop and 0.0.20 built using latest arch linux

gcc 15.2.1, cmake 4.2.3

to reproduce:

• create project
• create any graph
• press ctrl+B
• try to put the marker somewhere on the graph
• segfault appears