wallabag: Segfault on new entry with PHP 7.2.1

Issue details

After updating my installation, adding a new entry would always result in a 502 Bad Gateway (using webinterface or API). When running with the PHP-builtin server, I get The process has been signaled with signal "11" with the server crashing (nginx doesn’t crash). That apparently means segfault in PHP.

After downgrading back to PHP 7.1.11, everything works fine again.

Environment

• wallabag version (or git revision) that exhibits the issue: 2.2.3
• Installed from the AUR
• php version: 7.1.11 / 7.2.1
• OS: Arch Linux
• type of hosting (shared or dedicated): dedicated
• which storage system you choose at install (SQLite, MySQL/MariaDB or PostgreSQL): SQLite

Steps to reproduce/test case

Install PHP 7.2.1, start wallabag, try to add an entry.