QGIS crashes when downloading a project on MacOS

[darthpolly]

My setup:

• Intel MacBookPro Late 2015
• MacOS Monterrey 12.7.6
• QGIS 3.44 Solothurn
• Mergin qgis-plugin version 2026.1.1

Steps to reproduce:

• Configure mergin plugin (custom server addr, user and pass). Test connection (returns green OK)
• At the browser panel, expand Mergin Maps (it correctly list my projects), right click on a project, click in "Download"
• File browser opens, select destination directory, hit Accept

Result:

• Sync dialog briefly flashes, and QGIS silently crashes. OS reports EXC_BAD_ACCESS

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What i found out:

I've been able to debug the plugin with first-aid, and found out it was something related to the geodiff package. Couldn't get to the bottom of the problem, but as I noticed it was using version 2.1.2, just tried to install the latest version of the package.

My steps:

• Clone geodiff source code from git
• Download dependencies (specifically sqlite-autoconf-3450000)
• ./configure sqlite with --enable-dynamic-extensions flag, and compile it
• follow geodiff instructions to compile it
• replace pygeodiff directory at ~/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins/Mergin/mergin/deps with the last version
• rename libpygeodiff.dylib (result of compiling geodiff) to libpygeodiff-2.2.0-python.dylib and move it inside the newly replaced pygeodiff directory.

After all this, the mergin plugin was able to download and sync projects.

Maybe is just a matter of packaging the mergin plugin with the latest version of geodiff, but I'll let decide that to maintainers!

[raherin]

I have another user reporting this issue on MacOS Their setup is:

Mac Mini M4 OS version macOS 26.3
QGIS version - 3.44.1-Solothurn
QGIS code branch - Release 3.44
Mergin Maps plugin - 2026.2.1