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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Qt build crashes on opening assembly: assertion failed in FindById","articleBody":"I’ve just compiled SolveSpace from the latest commits and the Qt version crashes when opening my assembly project.\n\nOn startup of the project, SolveSpace-Qt shows this error message:\n\n\u003e File ./src/dsc.h, line 506, function FindById:\n\u003e Assertion failed: t != nullptr.\n\u003e Message: Cannot find handle.\n\nAfter clicking OK, the application immediately closes.\n\nImportant notes:\nThe same project opens and works correctly in the GTK version.\nIt also worked in a previous Qt build (until the latest updates).\nThe crash happens only when opening this assembly.\n\nLet me know if you need the project file.\n\n\u003e I compiled with this command:\n\u003e cmake .. -DCMAKE_BUILD_TYPE=Release -DENABLE_OPENMP=ON -DENABLE_LTO=ON -DUSE_QT_GUI=ON\n","author":{"url":"https://github.com/dadoprom","@type":"Person","name":"dadoprom"},"datePublished":"2026-01-03T19:42:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/1668/solvespace/issues/1668"}