snapshot not showing anything past how often to backup on one site

I have an issue where snapshot isn't showing anything past how often to backup when editing a snapshot. I get the following error in my logs:

[09-Mar-2017 16:59:47 UTC] PHP Warning: Illegal string offset 'snapshot-hourly' in /storage/websites/ on line 881
[09-Mar-2017 16:59:47 UTC] PHP Fatal error: Uncaught Error: Cannot use string offset as an array in /storage/websites/
Stack trace:
#0 /storage/websites/ Snapshot_View_Metabox_Admin->snapshot_metabox_show_schedule_options('When to Archive', Array)
#1 /storage/websites/ Snapshot_View_Settings->snapshot_admin_show_edit_panel(Array)
#2 /storage/websites/ Snapshot_View_Settings->snapshot_admin_show_items_panel('')
#3 /storage/websites/ WP_Hook->apply_filters('', Array)
#4 /storage/websites/ WP_Hook->do_action(Array)
#5 /storage/websites/ do_action('toplevel_page_s...')
#6 {main}
thrown in /storage/websites/ on line 881