Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/checkout@v4, actions/setup-dotnet@v4. Actions will be forced to run with Node.js 24 by default starting June 2nd, 2026. Node.js 20 will be removed from the runner on September 16th, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Dereference of a possibly null reference.

Possible null reference argument for parameter 'key' in 'bool Dictionary<string, CellBorderInfo>.TryGetValue(string key, out CellBorderInfo value)'.

Possible null reference argument for parameter 'hex' in 'PdfColor PdfColor.FromHex(string hex)'.

Possible null reference argument for parameter 's' in 'bool NetFxPolyfills.Contains(string s, string value, StringComparison comparison)'.

Possible null reference argument for parameter 'key' in 'CellBorderInfo Dictionary<string, CellBorderInfo>.this[string key]'.

Possible null reference argument for parameter 'Style' in 'BorderSide.BorderSide(string Style, PdfColor? Color)'.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'preferredFontName' in 'void PdfWriter.PrioritizePreferredCjkFont(List<string> candidatePaths, string preferredFontName)'.

Possible null reference argument for parameter 'footerFormat' in 'void ExcelToPdfConverter.RenderPageFooter(IReadOnlyList<PdfPage> pages, string footerFormat, int startPage, int endPage, int totalPages, float footerY, float marginL, float marginR)'.