diff --git a/app/models/auth_user.rb b/app/models/auth_user.rb
index 8a637c81..e5b47fcc 100644
--- a/app/models/auth_user.rb
+++ b/app/models/auth_user.rb
@@ -9,6 +9,8 @@ class AuthUser < AuthRecord
     length: {maximum: 30}
 
   validates :uid, uniqueness: {scope: :provider, allow_nil: true}
+
+  validate :has_at_least_one_login_method
   
   has_one :user, foreign_key: :remote_id, inverse_of: :auth_user
 
@@ -136,6 +138,13 @@ class AuthUser < AuthRecord
     end
   end
 
+  def has_at_least_one_login_method
+    if !uses_password? && !email? && !uses_neopass?
+      errors.add(:base, "You must have either a password, an email, or a " +
+        "NeoPass. Otherwise, you can't log in!")
+    end
+  end
+
   def self.find_by_omniauth(auth)
     find_by(provider: auth.provider, uid: auth.uid)
   end