The first entry in the stack trace on detailed error page (when $g_show_detailed_errors = ON) is the MantisBT error handler.

As shown on the attached screenshot, this does not add any value, as all of the useful data is already available elsewhere on the page (filename, line number, error code and type). The last parameter (context) is deprecated and should be removed (see 0023942).

To reduce clutter on the error page and provide only meaningful information to the administrator, the error handler should not be part of the displayed stack trace.