Unexpected token

Hi there,

I updated my jQuery to 1.5 but now I get a little warning in the Console of Firefox:

Warnung: Unerwartetes Token im Attribut-Selektor: '!'.
Quelldatei: http://localhost/
Zeile: 0

Warning: Unexpected Token in Attribute-Selctor. '!'.
Source: http://localhost/
Line: 0