In the Module "Moderator Control Panel" -> Main -> "View topic" I get the following error message.

[phpBB Debug] PHP Warning: in file [ROOT]/includes/mcp/mcp_topic.php on line 201: Undefined variable $rowset_posttime

[phpBB Debug] PHP Warning: in file [ROOT]/includes/mcp/mcp_topic.php on line 201: Trying to access array offset on null

I get a message when I change the contents of the select box "Display posts from previous" and submit the form with the button "Go". 

This message appears when the time range in the box is so narrow that no posts are displayed.

Example:
The most recent post is two days old, and the specified time period is one day.