QGIS ended unexpectedly

[sashamurphy]

What is the bug or the crash?

Python Stack Trace
Windows fatal exception: access violation

Current thread 0x000012a4 (most recent call first):

Stack Trace

QgsMapLayer::type :
QgsDiscoverRelationsDialog::trUtf8 :
QgisApp::dxfExport :
QObject::qt_static_metacall :
QAction::activate :
QMenu::actionGeometry :
QMenu::actionGeometry :
QMenu::mouseReleaseEvent :
QWidget::event :
QMenu::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QSizePolicy::QSizePolicy :
QSizePolicy::QSizePolicy :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.40.14-Bratislava
QGIS code revision: ebe1e1f
Compiled against Qt: 5.15.13
Running against Qt: 5.15.13
Compiled against GDAL: 3.12.1
Running against GDAL: 3.12.1

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.19045

Steps to reproduce the issue

Trying to export to DXF:
Project -> Import/Export -> Export Project to DXF = crash window.

I was able to export this same project yesterday (12/01/26) without any problems

Versions

QGIS version
3.40.14-Bratislava
QGIS code revision
ebe1e1f

Libraries
Qt version
5.15.13
Python version
3.12.12
GDAL version
3.12.1 — Chicoutimi
PROJ version
9.7.1
EPSG Registry database version
v12.029 (2025-10-03)
GEOS version
3.14.1-CAPI-1.20.5
SQLite version
3.50.4
PDAL version
2.9.0
PostgreSQL client version
unknown
SpatiaLite version
5.1.0
QWT version
6.3.0
QScintilla2 version
2.14.1
OS version
Windows 10 Version 2009

Active Python plugins
db_manager
0.1.20
grassprovider
2.12.99
MetaSearch
0.3.6
processing
2.12.99

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[github-actions]

Thanks for reporting, however it looks like you are using an older version of QGIS (version 3.40.14) instead of latest (Version 3.44.6). Your bug could already be resolved in the latest version.
It takes a lot of human effort to triage all the bugs in a project like QGIS, could you please retry with the latest version first?

[gioman]

@sashamurphy also you must test with a new QGIS profile with no 3rd party plugins installed.

[sashamurphy]

Same problem with latest version 3.44:

Python Stack Trace
Windows fatal exception: access violation

Current thread 0x00004118 (most recent call first):

Stack Trace

QgsMapLayer::type :
QgsDiscoverRelationsDialog::tr :
QgisApp::dxfExport :
QObject::qt_static_metacall :
QAction::activate :
QMenu::actionGeometry :
QMenu::actionGeometry :
QMenu::mouseReleaseEvent :
QWidget::event :
QMenu::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QSizePolicy::QSizePolicy :
QSizePolicy::QSizePolicy :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.44.6-Solothurn
QGIS code revision: fb066c5
Compiled against Qt: 5.15.13
Running against Qt: 5.15.13
Compiled against GDAL: 3.12.1
Running against GDAL: 3.12.1

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.19045

[gioman]

Same problem with latest version 3.44:

@sashamurphy have you tested with a new QGIS profile and no 3rd party plugins installed?