Your version is past EOL. You should upgrade to either the latest version or the current LTS at your earliest convenience. Your upgrade path is:
8.6.1 → 8.9.3 → 9.2.1 (last step optional)
You may find the Upgrade Guide helpful. If you have questions about upgrading, feel free to open a new thread for that here.
Regarding your actual question, you’ve given very few details. If your problem persists after upgrade, feel free to come back to us with full details of what you’re trying to achieve, what you’ve done in the attempt and what the results are.