Upgrade to 2.1.3 Warnings

Hey

I upgraded from 2.1.2 to 2.1.3. After the installation the summary shows two warnings (in german):

Fehler beim Update der Tabelle für die Klasse modEvent
Array
(
[0]=> 42000
[1]=> 1091
[2]=> Can’t DROP ’name’; check that column/key exists
)

Fehler beim Update der Tabelle für die Klasse modEvent
Array
(
[0]=> 42000
[1]=> 1068
[2]=> Multiple primary key defined
)

What does that mean? What i’ve seen so far it’s all working...but i think these warnings are not for nothing.

Thanks