The Microsoft Access warning message “Run-time error ‘3159’: Not a valid bookmark” usually occurs when navigating records or forms in the VBA code. It indicates a corrupted bookmark or a reference to a deleted record. This error can prevent database users from accessing data properly. It often appears after importing data, editing forms, or restoring a backup. In this blog, we will delve into the insights of this error, including its causes and, most importantly, how to troubleshoot it.