In some versions of Laravel you need to specify the $table->increments('id') as $table->increments('id')->unsigned() to match the standard integer field $table->integer('customer_id') because the increments was saved as INT(11) and the standard integer as INT(10).

I didn't had this problem with Laravel4.1

Thanks i changed that and now i get this error. Andy ideas? [Exception]
SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (bbgapp.<result 2 when explaining filename '
#sql-2d1_381034'>, CONSTRAINT customers_memberships_customers_id_foreign FOREIGN KEY (customers_id) REFERENCES customers (id)) (SQL: alter table customers_m emberships add constraint customers_memberships_customers_id_foreign foreign key (customers_id) references customers (id) on delete restrict) (Bindings: array
(
))

Looks like the customer_id you're trying to insert doesn't exist.

Have you tired to create the foreign key wih empty tables ?