bugzilla upgrade error

Adding foreign key: test_case_components.component_id ->
components.id...
DBD::mysql::db do failed: Can't create table 'bugs.#sql-153e_1b2' (errno: 150) [for Statement "ALTER TABLE test_case_components ADD
     CONSTRAINT fk_test_case_components_component_id_components_id FOREIGN KEY (component_id)
     REFERENCES components(id)
      ON UPDATE CASCADE ON DELETE CASCADE"] at Bugzilla/DB.pm line 642.
	Bugzilla::DB::bz_add_fks('Bugzilla::DB::Mysql=HASH(0x7dd2488)', 'test_case_components', 'HASH(0x73e8e18)', 'HASH(0x8254fe0)') called at Bugzilla/DB.pm line 546
	Bugzilla::DB::bz_setup_foreign_keys('Bugzilla::DB::Mysql=HASH(0x7dd2488)') called at Bugzilla/Install/DB.pm line 745
	Bugzilla::Install::DB::update_table_definitions('HASH(0x24510d0)') called at ./checksetup.pl line 172