Catch broken non-free successor removal

What's Changed

• Fix #165 by @dfukagaw28 in #166
• updates link to documentation by @Nikoleta-v3 in #164

New Contributors

• @dfukagaw28 made their first contribution in #166
• @Nikoleta-v3 made their first contribution in #164

Full Changelog: 1.4.2...1.4.3