#1298 - Unknown or incorrect time zone: 'NULL' problem

Hi

Just recently I had to move my site from one account to another.
I took backup for files and DB with cpanel gui.
Then in new account I have tried to put my backup
and I got error during db import.

Then I have tried to put manually threw phpmysqladmin->SQL
and also it gives me more specify error like bellow

Error

SQL query:

/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

MySQL said: Documentation
#1298 - Unknown or incorrect time zone: 'NULL'

I have found recommendation on internet to delete

Will Drupal be affected if I will delete it?

ps.
I need to add that everything seems to works ok,
but I really don't want to find some nasty error much later when site will be almost finished.

Any Suggestions are welcome...