I'm facing the same issue with just a basic hello world email template.

[dharani-gaddam]

    I'm facing the same issue with just a basic hello world email template.

Mailjet::Send.create(messages: [{
  'From'=> {
    'Email'=> "[e-mail]",
    'Name'=> "abc"
  },
  'To'=> [
    {
      'Email'=> '[e-mail]',
      'Name'=> 'xyz'
    }
  ],
  'TemplateID'=> 12345,
  'Subject'=> "Test email using mailjet api",
  'TemplateLanguage'=> true,
  'Variables'=> {
    "firstname" => "xyz"
  }
}])

getting this error:
NoMethodError: undefined method `include?' for nil:NilClass

Can you please check @WeshGuillaume
Thanks in advance
Dharani

Originally posted by @dharani-gaddam in #62 (comment)

[Mikhail Grishko (Mykhailo Hryshko)]

Fixed in #244