Processing queries problem possibly caused by bugs

The Redmine interface to my svn repository is the last one I used. I tried to enter some queries to my project but after pressing Enter key and selected “Subject” or other, it displays a message that some bug have occurred.
Filter works only when I select Apply. Do you think it’s the bug that caused the problem? I have attached an image for a clear explanation to my problem. Please help me if you can fix this. Thank you.

