EINVAL QWaitCondition::wait(): cv wait failure (Invalid argument)

Even when QWaitCondition is not being used in the application source, Application gives message:

 error verbose 1 [] QWaitCondition::wait(): cv wait failure (Invalid argument).

Looks like the message is generated in the wait() function of the QWaitCondition class

 if (code && code != ETIMEDOUT)
report_error(code, "QWaitCondition::wait()", "cv wait");

Also, as far as I understand, this is an error:
#define EINVAL 22 /* Invalid argument */

attached stack trace for EINVAL(22) error. 

What could the QWaitCondition problem be related to?