Cannot activate Redirection

Hello,

I am unable to use Redirection due to a couple errors. I believe this started when I updated to WordPress 5.1.1, and updated Redirection to 4.2.3. I was prompted to up upgrade the Redirection database, which upgraded without issue. However, following this, I am unable to add new redirects, receiving the following error when I attempt to do so:

Unable to add new redirect (41): Incorrect integer value: ” for column ‘regex’ at row 1

Plugin: 4.2.3
WordPress: 5.1.1 (multi)
PHP: 7.2.17
Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0
JavaScript: https://www.website.com/subsite/wp-content/plugins/redirection/redirection.js
REST API: https://www.website.com/subsite/wp-json/

Error: Unable to add new redirect (41): Incorrect integer value: ” for column ‘regex’ at row 1
Action: redirection/v1/redirect/ POST
Params: {“id”:0,”url”:”/source”,”title”:””,”match_data”:{“source”:{“flag_regex”:false,”flag_trailing”:false,”flag_case”:false,”flag_query”:”exact”}},”match_type”:”url”,”action_type”:”url”,”position”:0,”group_id”:1,”action_code”:301,”action_data”:{“url”:”https://www.website.com/target”}}
Code: 400 Bad Request
Raw: {“code”:”redirect”,”message”:”Unable to add new redirect”,”data”:{“status”:400,”error_code”:41,”wpdb”:”Incorrect integer value: ” for column ‘regex’ at row 1″}}

Accompanied by an error in the server log:

PHP message: WordPress database error Incorrect integer value: ” for column ‘regex’ at row 1 for query INSERT INTO wp_5_redirection_items (regex, match_type, url, match_url, title, group_id, position, action_type, action_code, action_data, status) VALUES (”, ‘url’, ‘/source’, ‘/source’, ”, ‘1’, ‘3’, ‘url’, ‘301’, ‘https://www.website.com/target’, ‘enabled’) made by Red_Item::create” while reading response header from upstream, client: 130.111.28.84, server: http://www.website.com, request: “POST /subsite/wp-json/redirection/v1/redirect/?_wpnonce=3bb5ca08e7 HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php-fpm/php-fpm.sock:”, host: “www.website.com”, referrer: “https://www.website.com/subsite/wp-admin/tools.php?page=redirection.php”

If I try to uninstall and reinstall the plugin, it will prompt me to complete Redirection setup to finish installation. Trying to “Finish Setup” (setup makes it past initial options & REST API check) produces the following error:

Database problem

Failed to perform query “CREATE TABLE IF NOT EXISTS wp_redirection_items ( id int(11) unsigned NOT NULL AUTO_INCREMENT, url mediumtext NOT NULL, match_url varchar(2000) DEFAULT NULL, match_data text, regex int(11) unsigned NOT NULL DEFAULT ‘0’, position int(11) unsigned NOT NULL DEFAULT ‘0’, last_count int(10) unsigned NOT NULL DEFAULT ‘0’, last_access datetime NOT NULL DEFAULT ‘0000-00-00 00:00:00’, group_id int(11) NOT NULL DEFAULT ‘0’, status enum(‘enabled’,’disabled’) NOT NULL DEFAULT ‘enabled’, action_type varchar(20) NOT NULL, action_code int(11) unsigned NOT NULL, action_data mediumtext, match_type varchar(20) NOT NULL, title text, PRIMARY KEY (id), KEY url (url(191)), KEY status (status), KEY regex (regex), KEY group_idpos (group_id,position), KEY group (group_id), KEY match_url (match_url(191)) ) DEFAULT CHARACTER SET utf8mb4 COLLATE=utf8_general_ci”

Message: Failed to perform query “CREATE TABLE IF NOT EXISTS wp_redirection_items (
id int(11) unsigned NOT NULL AUTO_INCREMENT,
url mediumtext NOT NULL,
match_url varchar(2000) DEFAULT NULL,
match_data text,
regex int(11) unsigned NOT NULL DEFAULT ‘0’,
position int(11) unsigned NOT NULL DEFAULT ‘0’,
last_count int(10) unsigned NOT NULL DEFAULT ‘0’,
last_access datetime NOT NULL DEFAULT ‘0000-00-00 00:00:00’,
group_id int(11) NOT NULL DEFAULT ‘0’,
status enum(‘enabled’,’disabled’) NOT NULL DEFAULT ‘enabled’,
action_type varchar(20) NOT NULL,
action_code int(11) unsigned NOT NULL,
action_data mediumtext,
match_type varchar(20) NOT NULL,
title text,
PRIMARY KEY (id),
KEY url (url(191)),
KEY status (status),
KEY regex (regex),
KEY group_idpos (group_id,position),
KEY group (group_id),
KEY match_url (match_url(191))
) DEFAULT CHARACTER SET utf8mb4 COLLATE=utf8_general_ci”
Installed: –
Next: 4.1
Debug:

COLLATION ‘utf8_general_ci’ is not valid for CHARACTER SET ‘utf8mb4’
Table “wp_redirection_items” is missing
Table “wp_redirection_groups” is missing
Table “wp_redirection_logs” is missing
Table “wp_redirection_404” is missing
Stage: create_tables

If anyone can offer some tips on solving this issue, it would be much appreciated.

Thanks,
Zach