Type Error with Events Block

We are getting a TypeError when we try to use this Google Calendar iCal feed with the Events block that comes with the Coblocks plugin. The feed validates, and I have been unable to isolate which event in the feed is triggering the error.

Error message: 

Uncaught exception ‘TypeError’ with message ‘DateTimeZone::__construct(): Argument #1 ($timezone) must be of type string, DateTimeZone given’ in /code/wp-content/plugins/coblocks/includes/ical-parser/class-coblocks-ical.php:2653

in DateTimeZone::__construct called at /code/wp-content/plugins/coblocks/includes/ical-parser/class-coblocks-ical.php (2653)
in CoBlocks_ICal::parse_ex_dates called at /code/wp-content/plugins/coblocks/includes/ical-parser/class-coblocks-ical.php (1372)
in CoBlocks_ICal::process_recurrences called at /code/wp-content/plugins/coblocks/includes/ical-parser/class-coblocks-ical.php (769)
in CoBlocks_ICal::init_lines called at /code/wp-content/plugins/coblocks/includes/ical-parser/class-coblocks-ical.php (622)
in CoBlocks_ICal::init_file called at /code/wp-content/plugins/coblocks/includes/ical-parser/class-coblocks-ical.php (648)
in CoBlocks_ICal::init_url called at /code/wp-content/plugins/coblocks/src/blocks/events/index.php (37)
in coblocks_render_coblocks_events_block called at /code/wp-includes/class-wp-block.php (258)
in WP_Block::render called at /code/wp-includes/blocks.php (1484)
in render_block called at /code/wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php (190)
in WP_REST_Block_Renderer_Controller::get_item called at /code/wp-includes/rest-api/class-wp-rest-server.php (1193)
in WP_REST_Server::respond_to_request called at /code/wp-includes/rest-api/class-wp-rest-server.php (1041)
in WP_REST_Server::dispatch called at /code/wp-includes/rest-api/class-wp-rest-server.php (431)
in WP_REST_Server::serve_request called at /code/wp-includes/rest-api.php (424)
in rest_api_loaded called at /code/wp-includes/class-wp-hook.php (324)
in WP_Hook::apply_filters called at /code/wp-includes/class-wp-hook.php (348)
in WP_Hook::do_action called at /code/wp-includes/plugin.php (565)
in do_action_ref_array called at /code/wp-includes/class-wp.php (418)
in WP::parse_request called at /code/wp-includes/class-wp.php (813)
in WP::main called at /code/wp-includes/functions.php (1336)
in wp called at /code/wp-blog-header.php (16)
in require called at /code/index.php (17)