For redirecting from the block is taken into account the situation when the current time are a few sessions

manage.php

@@ -51,11 +51,19 @@
                   FROM {$CFG->prefix}attendance_sessions
                  WHERE $today BETWEEN sessdate AND (sessdate + duration)
                    AND courseid = $course->id";
-        if($att = get_record_sql($sql)) {
+        if($atts = get_records_sql($sql)) {
+            $size = count($atts);
+            if ($size == 1) {
+                $att = reset($atts);
                 if ((!$att->lasttaken and has_capability('mod/attforblock:takeattendances', $context)) or
                     ($att->lasttaken and has_capability('mod/attforblock:changeattendances', $context))) {
                     redirect('attendances.php?id='.$id.'&sessionid='.$att->id.'&grouptype='.$att->groupid);
                 }
+            } elseif ($size > 1) {
+                $current = $today;
+                //temporally set $view for single access to page from block
+                $view = 'days';
+            }
         }
 	}