    ﻿using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Text.RegularExpressions;

    namespace Nikse.SubtitleEdit.Core.SubtitleFormats
    {
        public class UnknownSubtitle38 : SubtitleFormat
        {
            private static readonly Regex RegexTimeCodes = new Regex(@"^\d+ \d\d:\d\d:\d\d:\d\d \d\d:\d\d:\d\d:\d\d$", RegexOptions.Compiled);

            public override string Extension => ".txt";

            public override string Name => "Unknown 38";

            public override string ToText(Subtitle subtitle, string title)
            {
                var sb = new StringBuilder();
                int index = 0;
                foreach (Paragraph p in subtitle.Paragraphs)
                {
                    //1 00:50:34:22 00:50:39:13
                    //Ich muss dafür sorgen,
                    //dass die Epsteins weiterleben
                    sb.AppendLine(string.Format("{4} {0} {1}{2}{3}{2}", EncodeTimeCode(p.StartTime), EncodeTimeCode(p.EndTime), Environment.NewLine, HtmlUtil.RemoveHtmlTags(p.Text), index));
                    index++;
                }
                return sb.ToString();
            }

            private static string EncodeTimeCode(TimeCode time)
            {
                //1 00:50:39:13 (last is frame)
                return $"{time.Hours:00}:{time.Minutes:00}:{time.Seconds:00}:{MillisecondsToFramesMaxFrameRate(time.Milliseconds):00}";
            }

            public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
            {
                //1 00:03:15:22 00:03:23:10
                //This is line one.
                //This is line two.
                Paragraph p = null;
                subtitle.Paragraphs.Clear();
                _errorCount = 0;
                foreach (string line in lines)
                {
                    if (RegexTimeCodes.IsMatch(line))
                    {
                        string[] temp = line.Split(' ');
                        if (temp.Length == 3)
                        {
                            string start = temp[1];
                            string end = temp[2];

                            string[] startParts = start.Split(SplitCharColon, StringSplitOptions.RemoveEmptyEntries);
                            string[] endParts = end.Split(SplitCharColon, StringSplitOptions.RemoveEmptyEntries);
                            if (startParts.Length == 4 && endParts.Length == 4)
                            {
                                p = new Paragraph(DecodeTimeCode(startParts), DecodeTimeCode(endParts), string.Empty);
                                subtitle.Paragraphs.Add(p);
                            }
                        }
                    }
                    else if (string.IsNullOrWhiteSpace(line))
                    {
                        // skip these lines
                    }
                    else if (p != null)
                    {
                        if (string.IsNullOrEmpty(p.Text))
                            p.Text = line;
                        else
                            p.Text = p.Text + Environment.NewLine + line;
                    }
                }

                subtitle.Renumber();
            }

            private static TimeCode DecodeTimeCode(string[] parts)
            {
                //00:00:07:12
                string hour = parts[0];
                string minutes = parts[1];
                string seconds = parts[2];
                string frames = parts[3];
                return new TimeCode(int.Parse(hour), int.Parse(minutes), int.Parse(seconds), FramesToMillisecondsMax999(int.Parse(frames)));
            }

        }
    }

↑ V3095 The 'line' object was used before it was verified against null. Check lines: 49, 64.