https://mail.kde.org/pipermail/distributions/2026-May/001681.html
https://qt-project.atlassian.net/browse/QTBUG-145310
https://codereview.qt-project.org/c/qt/qtbase/+/727830
--- a/src/gui/text/freetype/qfontengine_ft.cpp
+++ b/src/gui/text/freetype/qfontengine_ft.cpp
@@ -1956,9 +1956,11 @@
 
     err = FT_Render_Glyph(slot, renderMode);
-    if (err != FT_Err_Ok)
-        qWarning("render glyph failed err=%x face=%p, glyph=%d", err, face, glyph);
-
     FT_Library_SetLcdFilter(slot->library, FT_LCD_FILTER_NONE);
 
+    if (err != FT_Err_Ok) {
+        qWarning("render glyph failed err=%x face=%p, glyph=%d", err, face, glyph);
+        return nullptr;
+    }
+
     info.height = slot->bitmap.rows;
     info.width = slot->bitmap.width;