What web browser are you using?
mostly firefox
Common bug https://bugzilla.mozilla.org/show_bug.cgi?id=908446
To fix it
1. Go to FireFox's configuration editor by typing about:config where you'd type a URL address and press Enter.
2. Ignore the warning message, this is standard procedure.
3. Scroll down to Browser.sessionhistory.max total viewers.
It is probably set to -1.
Change it to 0 (not 1, not 2, but ZERO).
Problems solved!