Issue

This is a rare error that occurs when something goes wrong with the user's hard drive. Pulsar uses an encrypted SQLite database to store user data on the device and when the hard disk malfunctions, the application cannot access the database and prints the above log message. 

Another reason is the failure in disk drive/ flash memory. It can happen to the content of the file and result in corruption.

Solution

Here is a blog post that we think is helpful to understand what could cause this problem: https://sqliteviewer.com/blog/database-disk-image-malformed/