Database error Cannot load from mysql.proc.

This error comes up for each job run,

“WARNING: Database error Cannot load from mysql.proc. The table is probably corrupted for query SHOW FUNCTION STATUS”

and

“WARNING: Database error Cannot load from mysql.proc. The table is probably corrupted for query SHOW PROCEDURE STATUS”

Questions
1. Is there a fix to this?
2. How does this effect using the backup to restore the website?

Log Report
Log Report below. I {removed} anything to do with identifying the website, reason is to avoid hackers.

[INFO] BackWPup 3.3.7; A project of Inpsyde GmbH
[INFO] WordPress 4.7.4 on {removed}
[INFO] Log Level: Normal
[INFO] BackWPup job: 2017 Build Backups
[INFO] Logfile is: {removed}
[INFO] Backup file is: {removed}
[25-Apr-2017 11:55:22] 1. Try to backup database …
[25-Apr-2017 11:55:23] Connected to database {removed} on {removed}
[25-Apr-2017 11:55:25] WARNING: Database error Cannot load from mysql.proc. The table is probably corrupted for query SHOW FUNCTION STATUS
[25-Apr-2017 11:55:25] WARNING: Database error Cannot load from mysql.proc. The table is probably corrupted for query SHOW PROCEDURE STATUS
[25-Apr-2017 11:55:26] Added database dump "{removed}" with 19.73 MB to backup file list
[25-Apr-2017 11:55:26] Database backup done!
[25-Apr-2017 11:55:28] 1. Trying to make a list of folders to back up …
[25-Apr-2017 11:55:47] Added "wp-config.php" to backup file list
[25-Apr-2017 11:55:47] 981 folders to backup.
[25-Apr-2017 11:55:49] 1. Trying to create a WordPress export to XML file …
[25-Apr-2017 11:55:57] Check WP Export file …
[25-Apr-2017 11:55:57] WP Export file is a valid WXR file.
[25-Apr-2017 11:55:57] Added XML export "{removed}" with 4.85 MB to backup file list.
[25-Apr-2017 11:56:00] 1. Trying to generate a file with installed plugin names …
[25-Apr-2017 11:56:00] Added plugin list file "{removed}" with 3.20 KB to backup file list.
[25-Apr-2017 11:56:00] 1. Trying to generate a manifest file …
[25-Apr-2017 11:56:00] Added manifest.json file with 7.53 KB to backup file list.
[25-Apr-2017 11:56:00] 1. Trying to create backup archive …
[25-Apr-2017 11:56:00] Compressing files as TarGz. Please be patient, this may take a moment.
[25-Apr-2017 12:00:30] ERROR: Aborted by user!