diff --git a/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs b/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
index 6b96bceda..19b782040 100644
--- a/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
+++ b/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
@@ -30,6 +30,7 @@ public class ReleaseGroupParserFixture : CoreTest
         [TestCase("Ghosted.S01E08.Haunted.Hayride.720p.AMZN.WEBRip.DDP5.1.x264-NTb-postbot", "NTb")]
         [TestCase("Ghosted.S01E08.Haunted.Hayride.720p.AMZN.WEBRip.DDP5.1.x264-NTb-xpost", "NTb")]
         [TestCase("Series Title - S01E01 - Episode Title [RlsGroup]", "RlsGroup")]
+        [TestCase("Black Monday S01 E01-E02 1080p AMZN WEBRip DDP5.1 x264 monkee", null)]
         //[TestCase("", "")]
         public void should_parse_release_group(string title, string expected)
         {
diff --git a/src/NzbDrone.Core/Parser/Parser.cs b/src/NzbDrone.Core/Parser/Parser.cs
index 4ffc20be3..58df4cc78 100644
--- a/src/NzbDrone.Core/Parser/Parser.cs
+++ b/src/NzbDrone.Core/Parser/Parser.cs
@@ -328,6 +328,10 @@ public static class Parser
         private static readonly Regex ReleaseGroupRegex = new Regex(@"-(?<releasegroup>[a-z0-9]+)(?<!WEB-DL|480p|720p|1080p|2160p)(?:\b|[-._ ])|[-._ ]\[(?<releasegroup>[a-z0-9]+)\]$",
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
+
+        private static readonly Regex InvalidReleaseGroupRegex = new Regex(@"^[se]\d+$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+
         private static readonly Regex AnimeReleaseGroupRegex = new Regex(@"^(?:\[(?<subgroup>(?!\s).+?(?<!\s))\](?:_|-|\s|\.)?)",
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
@@ -571,6 +575,11 @@ public static string ParseReleaseGroup(string title)
                     return null;
                 }
 
+                if (InvalidReleaseGroupRegex.IsMatch(group))
+                {
+                    return null;
+                }
+
                 return group;
             }