Same problem as this one but this time for Custom Header Links
Maybe this is better handled server side instead of fixing it in individual theme components?
lib/theme_settings_manager/objects.rb:13:in `parse'
lib/theme_settings_manager/objects.rb:13:in `value='
app/models/theme.rb:760:in `update_setting'
app/models/theme.rb:881:in `block (2 levels) in migrate_settings'
app/models/theme.rb:880:in `each'
app/models/theme.rb:880:in `block in migrate_settings'
app/models/theme.rb:919:in `migrate_settings'
app/models/remote_theme.rb:377:in `block in update_from_remote'