It looks like problem is coming from any of installed plug in or your theme.
- Backup your database.
- Switch to default wordpress theme.
- If problem disappears, your theme is the culprit.
- If problem still exists, Deactivate all installed plugins.
- If problem disappears, activate plugins one by one and see which plugin causes the error.
- If problem still exists, you might need a fresh wordpress install.
If any plugin or theme causes the problem, report to the developer and wait for the solution. Or find an alternate plugin or theme.
Hope it helps..
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