Unexpected non-MediaWiki exception encountered, of type &quot;TypeError&quot;<br />
[204734a2] /wiki_de/api.php?action=query&amp;cmtitle=Category%3APhysics&amp;list=categorymembers   Exception from line 188 of /home/httpd/vhosts/fuchsloch.ch/dynpg/wiki_de/includes/api/ApiQueryBase.php: count(): Argument #1 ($value) must be of type Countable|array, string given<br />
Backtrace:<br />
#0 /home/httpd/vhosts/fuchsloch.ch/dynpg/wiki_de/includes/api/ApiQueryCategoryMembers.php(83): ApiQueryBase-&gt;addWhereFld(string, string)<br />
#1 /home/httpd/vhosts/fuchsloch.ch/dynpg/wiki_de/includes/api/ApiQueryCategoryMembers.php(39): ApiQueryCategoryMembers-&gt;run()<br />
#2 /home/httpd/vhosts/fuchsloch.ch/dynpg/wiki_de/includes/api/ApiQuery.php(282): ApiQueryCategoryMembers-&gt;execute()<br />
#3 /home/httpd/vhosts/fuchsloch.ch/dynpg/wiki_de/includes/api/ApiMain.php(913): ApiQuery-&gt;execute()<br />
#4 /home/httpd/vhosts/fuchsloch.ch/dynpg/wiki_de/includes/api/ApiMain.php(363): ApiMain-&gt;executeAction()<br />
#5 /home/httpd/vhosts/fuchsloch.ch/dynpg/wiki_de/includes/api/ApiMain.php(334): ApiMain-&gt;executeActionWithErrorHandling()<br />
#6 /home/httpd/vhosts/fuchsloch.ch/dynpg/wiki_de/api.php(85): ApiMain-&gt;execute()<br />
#7 {main}<br />