I have the same thing on my Windows box with PHP5 and MySQL 5.
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-admin\\edit.php on line 102, referer: https://blog.onzin.org/wp-admin/
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/edit.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/link-manager.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/themes.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/plugins.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/profile.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/options-general.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/options-general.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/options-general.php?updated=true
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/post.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-includes\\functions.php on line 1161, referer: https://blog.onzin.org/wp-admin/post.php
[client 145.97.221.97] PHP Warning: Invalid argument supplied for foreach() in D:\\srv\\http\\wordpress\\wp-admin\\edit.php on line 102, referer: https://blog.onzin.org/wp-admin/post.php