With samba started locally.
Execute kwrite
Press "save as" and go to network, then Samba shared resources, wait for the error. Then change to smb://127.0.0.1 and press enter, select a place to save the file in the local samba.
Again press "save as" and go to network, then Samba shared resources.
Previously, always crash.
Now, again the error message (Next thing to investigate).