Error handling of function bugnote_stats_get_project_array (used only for built in timetracking) accesses undefined variable.

$p_form instead of $p_from, line 640:

if ( $c_to === false || $c_from === false ) {
    error_parameters( array( $p_from, $p_to ) ); // <<-- here
    trigger_error( ERROR_GENERIC, ERROR );
}