Undefined variable: canonical_url in structured_data_get_setting() line 118

after instal i received this error.
Notice: Undefined variable: canonical_url in structured_data_get_setting() (line 118 of /home/senssart/public_html/sites/all/modules/contrib/structured_data/structured_data.module).
I update Metatag module at least version.
Sorry for my poor english.