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DiscordClient throws when registering command with some overloads

See original GitHub issue


A NullReferenceException occurs when trying to register a command with some overloads with default values, but works fine if you make overloads explicit.


Using .net core 2.1 with DSharpPlus & CommandsNext nightly 4.0.0-nightly-00564.


System.NullReferenceException: Object reference not set to an instance of an object.
   at DSharpPlus.DiscordClient.Dispose()
   at CompatBot.Program.Main(String[] args) in C:\\Develop\\discord-bot\\CompatBot\\Program.cs:line 262

Line 262 is the end of the using scope, it throws on registering the command inside said scope.

Example of a command overload:

class BadOverload
    public async Task Crash(CommandContext ctx, int? year = null) => ;

    public async Task Crash(CommandContext ctx, string name = null, int? year = null) => ;

Steps to reproduce

  1. Have a command overload similar to example

  2. Try to register it to the client

  3. Observe exception

  4. Change overloads to be explicit (4 instead of 2 with default value)

  5. Observe no exceptions


Exception that is being thrown, is useless as it points to trying to dispose a null client for some reason, instead of pointing to the issue with overload resolving.

Issue Analytics

  • State:closed
  • Created 5 years ago
  • Comments:11 (11 by maintainers)

github_iconTop GitHub Comments

WamWooWamcommented, Feb 6, 2019

Don’t do that, dispose the client when you’re application exits, or alternatively don’t at all, in doing so you’re disconnecting the client, probably before it actually connects in the first place

WamWooWamcommented, Feb 6, 2019

Also are you using your discord client? Because you shouldn’t be doing that

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