Param "Nul" error

After my update to 1.8 I see this error on the Visitors Log page:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3)
Timestamp: Fri, 1 Jun 2012 15:51:58 UTC

Message: ‘param’ is null or not an object
Line: 1101
Char: 3
Code: 0

Thanks for the report, bug created in: Error with Internet explorer on visitor log: Message: 'param' is null or not an object · Issue #3171 · matomo-org/matomo · GitHub