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Laravel 5.6 Migration error SQLSTATE[42000]

I am working on a project, i ran a migration and stumbled on an error,
here is my code.

Schema::create('tasks', function (Blueprint $table)
$table->increments('id');
$table->string('name');
$table->integer('project_id')->unsigned();
$table->integer('user_id')->unsigned();
$table->integer('days')->unsigned()->nullable();
$table->integer('hours')->unsigned()->nullable();

$table->foreign('company_id')->unsigned()->nullable();
$table->foreign('user_id')->references('id')->on('users');

$table->foreign('project_id')->references('id')->on('projects');
$table->foreign('company_id')->references('id')->on('companies');
$table->timestamps();
);


Here is the error.

IlluminateDatabaseQueryException : SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 1 (SQL: alter table tasks add constraint tasks_company_id_foreign foreign key (company_id) references `` ())

tasks

tasks_company_id_foreign

company_id

1 PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 1")
C:xampphtdocsblogvendorlaravelframeworksrcIlluminateDatabaseConnection.php:452

2 PDO::prepare("alter table tasks add constraint tasks_company_id_foreign foreign key (company_id) references `` ()")
C:xampphtdocsblogvendorlaravelframeworksrcIlluminateDatabaseConnection.php:452

tasks

tasks_company_id_foreign

company_id

I need some help.

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