bug: accounts.email.accounts.aerc.enable causes " error: cannot coerce null to a string"

[jennydaman]

Are you following the right branch?

• My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

• I have searched the existing issues

Issue description

Consider a minimal email config with aerc enabled:

{ lib, pkgs, ... }:

{
  accounts.email.accounts."example" = {
    primary = true;
    address = "hello@example.org";
    realName = "Example email";

    # imap.host = "localhost";
    # imap.port = 1143;
    # smtp.host = "localhost";
    # smtp.port = 1025;

    aerc.enable = true;
  };
}

The above example works, however uncommenting either imap or smtp settings will result in the error

error:
       … while calling the 'derivationStrict' builtin

         at /builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'home-manager-generation'
         whose name attribute is located at /nix/store/v4pcs3nzx54m5bmxd39win0rgl2d2hbx-source/pkgs/stdenv/generic/make-derivation.nix:331:7

       … while evaluating attribute 'buildCommand' of derivation 'home-manager-generation'

         at /nix/store/v4pcs3nzx54m5bmxd39win0rgl2d2hbx-source/pkgs/build-support/trivial-builders/default.nix:68:16:

           67|         enableParallelBuilding = true;
           68|         inherit buildCommand name;
             |                ^
           69|         passAsFile = [ "buildCommand" ]

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: cannot coerce null to a string

Maintainer CC

No response

System information

- system: `"x86_64-linux"`
 - host os: `Linux 6.6.27, NixOS, 24.05 (Uakari), 24.05pre612742.66adc1e47f87`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.2`
 - channels(root): `"nixos"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`