Version:           4.1 (using KDE 4.7.1) 
OS:                Linux

nepomuk repeatedly writes: 
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid argument (1)": "ht
tp://www.w3.org/1999/02/22-rdf-syntax-ns#type has a rdfs:range of http://www.w3.org/2000/01/rdf-schema
#Class"
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(6568)" Soprano: "Invalid iterator."

into my .xsession-errors file, and it grows incredibly big, using all the free space on my /home partition (about 40 GB).

Reproducible: Always

Steps to Reproduce:
Start KDE with nepomuk and strigi enabled, and wait long enough for the .xsession-errors file to grow.


Expected Results:  
.xsession-errors to remain a reasonable size.