Cannot access settings on Docker ProGet 4.0.2

After the container has been running for a while it stops allowing me from accessing the settings page, returning this error:

System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.NullReferenceException: Object reference not set to an instance of an object
at NpgsqlTypes.BasicNativeToBackendTypeConverter.StringToTextText (NpgsqlTypes.NpgsqlNativeTypeInfo TypeInfo, System.Object oNativeData, Boolean forExtendedQuery, NpgsqlTypes.NativeToBackendTypeConverterOptions options, Boolean arrayElement) [0x00000] in <filename unknown>:0 
at (wrapper delegate-invoke) <Module>:invoke_byte[]_NpgsqlNativeTypeInfo_object_bool_NativeToBackendTypeConverterOptions_bool (NpgsqlTypes.NpgsqlNativeTypeInfo,object,bool,NpgsqlTypes.NativeToBackendTypeConverterOptions,bool)
at NpgsqlTypes.NpgsqlNativeTypeInfo.ConvertToBackendPlainQuery (System.Object NativeData, NpgsqlTypes.NativeToBackendTypeConverterOptions options, Boolean arrayElement) [0x00000] in <filename unknown>:0 
at NpgsqlTypes.NpgsqlNativeTypeInfo.ConvertToBackend (System.Object NativeData, Boolean forExtendedQuery, NpgsqlTypes.NativeToBackendTypeConverterOptions options, Boolean arrayElement) [0x00000] in <filename unknown>:0 
at Npgsql.NpgsqlCommand.AppendParameterValue (System.IO.Stream dest, Npgsql.NpgsqlParameter parameter) [0x00000] in <filename unknown>:0 
at Npgsql.NpgsqlCommand.AppendParameterValues (System.IO.Stream dest) [0x00000] in <filename unknown>:0 
at Npgsql.NpgsqlCommand.GetCommandText (Boolean prepare) [0x00000] in <filename unknown>:0
at Npgsql.NpgsqlCommand.GetCommandText () [0x00000] in <filename unknown>:0 
at Npgsql.NpgsqlCommand.GetReader (CommandBehavior cb) [0x00000] in <filename unknown>:0 
at Npgsql.NpgsqlCommand.ExecuteReader (CommandBehavior cb) [0x00000] in <filename unknown>:0 
--- End of inner exception stack trace ---
at System.Web.UI.Page.ProcessException (System.Exception e) [0x00000] in <filename unknown>:0 
at System.Web.UI.Page.ProcessRequest (System.Web.HttpContext context) [0x00000] in <filename unknown>:0 
at System.Web.HttpApplication+<Pipeline>c__Iterator1.MoveNext () [0x00000] in <filename unknown>:0 
at System.Web.HttpApplication.Tick () [0x00000] in <filename unknown>:0

If I restart the container everything is working fine again. I have not been able to find any pattern rather than that the container works when I restart it but then eventually this issue happens.

Pushing/Getting packages still works as expected.

Product: ProGet
Version: 3.8.1

Thanks for the report. This may be a bug in the PostgreSQL driver. We will work on trying to reproduce this inside a test environment and see if we can isolate the cause, but this type of issue is notoriously difficult to solve, and is why we have had such a long beta period for ProGet on Linux.

About how long does it take for this to start happening?

Last time it happened after 2 days (or maybe less, but that's when I noticed), but now it has been running for 4 days and it still works. We have been using the NuGet feed a few times during those 4 days.

I will keep monitoring it and report back if I find anything!