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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"PS 3.0.0-alpha11: crash on startup due to system locale","articleBody":"### Description of the bug\n\nIf my locale includes any non-english selection, then starting prusaslicer 3.0.0-alpha11 results in the following crash:\n```\nterminate called after throwing an instance of 'std::runtime_error'\n  what():  locale::facet::_S_create_c_locale name not valid\n```\n\nThe issue goes away as soon as i switch it to something based on english.\n\n### Zipped project file & How to reproduce\n\nThe following locale causes a crash:\n```\n~$ locale\nLANG=en_US.UTF-8\nLC_CTYPE=\"en_US.UTF-8\"\nLC_NUMERIC=\"en_US.UTF-8\"\nLC_TIME=C\nLC_COLLATE=\"en_US.UTF-8\"\nLC_MONETARY=en_IE.UTF-8\nLC_MESSAGES=\"en_US.UTF-8\"\nLC_PAPER=en_IE.UTF-8\nLC_NAME=C\nLC_ADDRESS=C\nLC_TELEPHONE=nl_NL.UTF-8\nLC_MEASUREMENT=en_IE.UTF-8\nLC_IDENTIFICATION=\"en_US.UTF-8\"\nLC_ALL=\n```\n\nWhereas this works just fine:\n```\n~$ locale\nLANG=en_US.UTF-8\nLC_CTYPE=\"en_US.UTF-8\"\nLC_NUMERIC=\"en_US.UTF-8\"\nLC_TIME=C\nLC_COLLATE=\"en_US.UTF-8\"\nLC_MONETARY=en_IE.UTF-8\nLC_MESSAGES=\"en_US.UTF-8\"\nLC_PAPER=en_IE.UTF-8\nLC_NAME=C\nLC_ADDRESS=C\nLC_TELEPHONE=C\nLC_MEASUREMENT=en_IE.UTF-8\nLC_IDENTIFICATION=\"en_US.UTF-8\"\nLC_ALL=\n```\n\nOnly difference between the two is `LC_TELEPHONE` being in Dutch instead of `en_*` or `C`.\n\n### Version of PrusaSlicer\n\n3.0.0-alpha11\n\n### Operating system\n\nLinux\n\n### Operating system version\n\nFedora 44\n\n### Printer model\n\nNot relevant","author":{"url":"https://github.com/leptun","@type":"Person","name":"leptun"},"datePublished":"2026-09-04T09:44:00Z","url":"https://github.com/prusa3d/PrusaSlicer/issues/15747"}