Biblatex creates big linebreaks if Reference Entry fills whole line

Question

I use biblatex to cite my references. Printing my bibliography works almost as expected. If the entry's last character (in my case a dot) is at the end of a line, a big line break occurs. So a big gap is between the entry and the next one.

Here is a screenshot. The spacing between [91] and [92] is bigger, due to [91] text is filling the whole line.

I assume the big break should separate entries visually.

Any ideas where to remove this extra big linebreak?

UPDATE: I found this snippet in my class template:

% Autoref
\addto\extrasngerman{%
     \def\equationautorefname~#1\null{(#1)\null} %Reference to equations in parentheses
}%

If delete these lines, the problem is gone. Does this make sense?? Seems i need an alternative to display referenced equations in parentheses like: (1).

Answer 1

There is a spurious space in the \extrasngerman call

\documentclass[british,ngerman]{article}
\usepackage[T1]{fontenc}
\usepackage{babel}

\addto\extrasngerman{%
     \def\equationautorefname~#1\null{(#1)\null} %Reference to equations in parentheses
}%

\begin{document}
A\selectlanguage{ngerman}B\selectlanguage{british}C
\end{document}

The space before the % might cause unwanted space when you switch languages in some contexts.

You could try

\documentclass[british,ngerman]{article}
\usepackage[T1]{fontenc}
\usepackage{babel}

\addto\extrasngerman{%
  \def\equationautorefname~#1\null{(#1)\null}%
}

\begin{document}
A\selectlanguage{ngerman}B\selectlanguage{british}C
\end{document}

instead, which should not introduce spurious spaces when the language is switched.

Whether this helps resolve the issue in your document is hard to tell from afar, but this is all we got at the moment.