In ZenCart versions immediately prior to 1.3.6 using many of the public side manufacturers functions may produce this error:
Warning: constant(): Couldn't find constant in .../includes/init_includes/init_add_crumbs.php on line 45
The error is caused by a missing database column that was added in the official 1.3.6 release. If upgrade is not immediately possible the following SQL snippet will correct the problem in most cases:
ALTER TABLE get_terms_to_filter ADD get_term_table varchar(64) NOT NULL;
ALTER TABLE get_terms_to_filter ADD get_term_name_field varchar(64) NOT NULL;
UPDATE get_terms_to_filter SET get_term_table = 'TABLE_MANUFACTURERS', get_term_name_field = 'manufacturers_name' WHERE get_term_name = 'manufacturers_id';
UPDATE get_terms_to_filter SET get_term_table = 'TABLE_MUSIC_GENRE', get_term_name_field = 'music_genre_name' WHERE get_term_name = 'music_genre_id';
UPDATE get_terms_to_filter SET get_term_table = 'TABLE_RECORD_COMPANY', get_term_name_field = 'record_company_name' WHERE get_term_name = 'record_company_id';
ALTER TABLE get_terms_to_filter ADD get_term_name_field varchar(64) NOT NULL;
UPDATE get_terms_to_filter SET get_term_table = 'TABLE_MANUFACTURERS', get_term_name_field = 'manufacturers_name' WHERE get_term_name = 'manufacturers_id';
UPDATE get_terms_to_filter SET get_term_table = 'TABLE_MUSIC_GENRE', get_term_name_field = 'music_genre_name' WHERE get_term_name = 'music_genre_id';
UPDATE get_terms_to_filter SET get_term_table = 'TABLE_RECORD_COMPANY', get_term_name_field = 'record_company_name' WHERE get_term_name = 'record_company_id';
If you are using other product types, some additional UPDATE statements will be required for your new product types.
I found this solution after some searching on the ZenCart forums.
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