I'm creating an app that sends an email; all work, email is sent and app seems to work.
Anyway a strange thread panicked is shown on the pane of QtCreator:

[...]
Application running with pid 2768.
--> CPtiXt9CandidateList::BuildL()
About to call ET9SelLstBuild()
ET9SelLstBuild() returned 0
ET9SelLstGetWord() returned 0
--> CPtiXt9CandidateList::BuildL()
About to call ET9SelLstBuild()
ET9SelLstBuild() returned 0
ET9SelLstGetWord() returned 0
ET9SelLstGetWord() returned 0
[Qt Message] qt_s60_setWindowGroupCursor - null handle
[Qt Message] qt_s60_setWindowGroupCursor - null handle
[Qt Message] qt_s60_setWindowGroupCursor - null handle
[Qt Message] qt_s60_setWindowGroupCursor - null handle
--> CPtiXt9CandidateList::BuildL()
About to call ET9SelLstBuild()
ET9SelLstBuild() returned 0
ET9SelLstGetWord() returned 0
--> CPtiXt9CandidateList::BuildL()
About to call ET9SelLstBuild()
ET9SelLstBuild() returned 0
ET9SelLstGetWord() returned 0
ET9SelLstGetWord() returned 0
ET9SelLstGetWord() returned 0
--> CPtiXt9CandidateList::BuildL()
About to call ET9SelLstBuild()
ET9SelLstBuild() returned 0
ET9SelLstGetWord() returned 0
ET9SelLstGetWord() returned 0
ET9SelLstGetWord() returned 0
Process 2768, thread 2769 stopped at 0x8043caeb: Thread 0xad1 has panicked. Category: Email client API; Reason: 0
Finished.

Last message (thread panicked) is raised when i terminate my app with qApp->quit()