Adding a column - generator tries to make it an auto-incrementing key

[redknitin]

I tried to add a column to a table, but it seems to want to make the column a primary key which is why it fails. The commands I ran are:
php artisan generate:migration add_account_id_to_transactions_table --fields="account_id:integer(11)"
php artisan migrate

The errors displayed are the following

[Illuminate\Database\QueryException]
SQLSTATE[42000]: Syntax error or access violation: 1075 Incorrect table def
inition; there can be only one auto column and it must be defined as a key
(SQL: alter table transactions add account_id int not null auto_increme
nt primary key)

[PDOException]
SQLSTATE[42000]: Syntax error or access violation: 1075 Incorrect table def
inition; there can be only one auto column and it must be defined as a key

[mfutselaar]

What is the type in the migration file? If it is defined as integer and not as increments, it's a Laravel issue, not a generator one.