- Add validation in TicketPdfGenerator to ensure QR code data integrity - Use compact() to remove nil values from QR code data hash - Add error handling in Ticket#generate_qr_code with fallback generation - Validate QR code data before passing to RQRCode library - Add proper error logging for QR code generation failures - Prevent "data must be a String, QRSegment, or an Array" errors 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>