biblatex URL shown twice in bibliography

Question

I didn't find a solution in the web, so I'm asking here.

I am using authoryear-icomp style for my bibliography (without any modification). When I have a BibTeX entry like:

@online{guizzo_i-limb_2008,
title = {{i-LIMB} snatches {MacRobert} Award - {IEEE} Spectrum},
url = {http://spectrum.ieee.org/automaton/robotics/robotics-software/ilimb_snatches_macrobert_award},
abstract = {{IEEE} Spectrum},
journal = {{IEEE} Spectrum},
author = {Guizzo, Erico},
month = jun,
year = {2008}
},

I get the URL twice in the bibliography. Once in the url field with nice linebreaks and once rudely running into the margins:

Guizzo, Erico (June 2008). i-LIMB snatches MacRobert Award - IEEE Spectrum.
http://spectrum.ieee.org/automaton/robotics/robotics-software/ilimb_snatches_macrobert_award.
URL: http://spectrum.ieee.org/automaton/robotics/robotics-software/ilimb_
snatches_macrobert_award.

How do I get rid of the entry not starting with URL (that is the one without linebreak)?

Answer 1

It was a matter of some old files in the temp directory par-username. There has been a howpublished = {http://spectrum.ieee.org/automaton/robotics/robotics-software/ilimb\_snatches\_macrobert\_award} entry that is not wrapped.

Answer 2

(answer / long comment with pic)

From your description I gathered the following MWE:

\documentclass{article}

\usepackage[style=authoryear-icomp,backend=biber]{biblatex}

\usepackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@online{guizzo_i-limb_2008,
title = {{i-LIMB} snatches {MacRobert} Award - {IEEE} Spectrum},
url = {http://spectrum.ieee.org/automaton/robotics/robotics-software/ilimb_snatches_macrobert_award},
abstract = {{IEEE} Spectrum},
journal = {{IEEE} Spectrum},
author = {Guizzo, Erico},
month = jun,
year = {2008}
}
\end{filecontents*}

\addbibresource{\jobname.bib}

\begin{document}
\nocite{*}

\printbibliography
\end{document}

No matter whether I use backend=biber or backend=biblatex, I can't reproduce your problem, this is my output:

Make sure your system is up-to-date. If that doesn't help, please post a minimal working example (MWE) that reproduces your problem.