diff --git a/classes/dml/outagedb.php b/classes/dml/outagedb.php
index 963ac3f..112787b 100644
--- a/classes/dml/outagedb.php
+++ b/classes/dml/outagedb.php
@@ -211,21 +211,20 @@ class outagedb {
             throw new coding_exception('$time must be null or a positive int.', $time);
         }
 
-        $select = ':datetime2 <= stoptime AND (finished IS NULL OR :datetime3 <= finished)'; // End condition.
-        $select = "(warntime <= :datetime1 AND (${select}))"; // Full select part.
-        $data = $DB->get_records_select(
-            'auth_outage',
-            $select,
-            ['datetime1' => $time, 'datetime2' => $time, 'datetime3' => $time],
-            'starttime ASC, stoptime DESC, title ASC',
-            '*',
-            0,
-            1
-        );
+        // Get cached outage, or null.
+        $outageinfo = get_config('moodle', 'auth_outage_active_outage');
 
-        // Not using $DB->get_record_select instead because there is no 'limit' parameter.
-        // Allowing multiple records still raises an internal error.
-        return (count($data) == 0) ? null : new outage(array_shift($data));
+        if (!$outageinfo) {
+            return null;
+        } else {
+            $outagecache = new outage(json_decode($outageinfo));
+        }
+
+        if ($outagecache && $outagecache->warntime <= $time && $outagecache->stoptime >= $time
+            && (!$outagecache->finished || $outagecache->finished >= $time)) {
+            return  $outagecache;
+        }
+        return null;
     }
 
     /**
diff --git a/classes/local/outage.php b/classes/local/outage.php
index 5fc6174..f9907e4 100644
--- a/classes/local/outage.php
+++ b/classes/local/outage.php
@@ -297,4 +297,12 @@ class outage {
         // Adjust bool fields.
         $this->autostart = ($this->autostart === null) ? null : (bool)$this->autostart;
     }
+
+    /**
+     * Return json encoded outage.
+     * @return string Json string.
+     */
+    public function __toString() {
+        return json_encode(get_object_vars($this));
+    }
 }
diff --git a/classes/local/outagelib.php b/classes/local/outagelib.php
index 6d76759..7d5b340 100644
--- a/classes/local/outagelib.php
+++ b/classes/local/outagelib.php
@@ -210,6 +210,10 @@ class outagelib {
         } else {
             $ongoingoutage = true;
         }
+
+        // Set json formatted outage string to cache.
+        set_config('auth_outage_active_outage', (string)$outage);
+
         maintenance_static_page::create_from_outage($outage)->generate();
         self::update_climaintenance_code($outage);
         if (!$ongoingoutage || $reenablemaint || is_null($outage)) {
diff --git a/tests/phpunit/dml/outagedb_test.php b/tests/phpunit/dml/outagedb_test.php
index fe5b237..def70b1 100644
--- a/tests/phpunit/dml/outagedb_test.php
+++ b/tests/phpunit/dml/outagedb_test.php
@@ -244,6 +244,15 @@ class auth_outage_outagedb_test extends auth_outage_base_testcase {
         $activeid = self::saveoutage(false, $now, -2, 1, 2, 'An outage in warning period.');
         self::assertSame($activeid, outagedb::get_active($now)->id, 'Wrong active outage picked.');
 
+        $activeid = self::saveoutage(false, $now, -2, 0, 2, 'An outage starts now.');
+        self::assertSame($activeid, outagedb::get_active($now)->id, 'Wrong active outage picked.');
+
+        self::saveoutage(false, $now, -2, 0, -1, 'Invalid outage.');
+        self::assertSame($activeid, outagedb::get_active($now)->id, 'Wrong active outage picked.');
+
+        self::saveoutage(false, $now, -2, 0, 0, 'Invalid outage.');
+        self::assertSame($activeid, outagedb::get_active($now)->id, 'Wrong active outage picked.');
+
         self::saveoutage(false, $now, -1, 2, 3,
             'Another outage in warning period, but ignored as it starts after the previous one.');
         self::assertSame($activeid, outagedb::get_active($now)->id, 'Wrong active outage picked.');
diff --git a/version.php b/version.php
index 304b90b..3482760 100644
--- a/version.php
+++ b/version.php
@@ -28,8 +28,8 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = "auth_outage";
-$plugin->version = 2022042800;                  // The current plugin version (Date: YYYYMMDDXX).
-$plugin->release = 2022042800;                  // Human-readable release information.
+$plugin->version = 2022051200;                  // The current plugin version (Date: YYYYMMDDXX).
+$plugin->release = 2022051200;                  // Human-readable release information.
 $plugin->requires = 2017111309;                 // 2017111309 = T13, but this really requires 3.9 and higher.
 $plugin->maturity = MATURITY_STABLE;            // Suitable for PRODUCTION environments!
 $plugin->supported = [39, 311];                 // A range of branch numbers of supported moodle versions.