nepomukservicestub spews cv wait failure message to .xsession-errors

nepomukservicestub spews cv wait failure message to .xsession-errors after it has finished indexing. It outputs it so much that within a 2 day period the .xsession-errors file grew to be over 150GB!

here is the message it constantly outputs.
[/usr/bin/nepomukservicestub] QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument
QMutex::lock(): cv wait failure: Invalid argument

Computer:
Kubuntu 11.10 amd64