diff --git a/cron.php b/cron.php
index 683f605..29e8e7e 100644
--- a/cron.php
+++ b/cron.php
@@ -1,10 +1,6 @@
 <?php
 namespace YTKNS;
 
-// Prevent running cron script during maintenance
-if(YTKNS_MAINTENANCE)
-    return;
-
 if(!defined('YTKNS_SEM_NAME'))
     define('YTKNS_SEM_NAME', 'b');
 if(!defined('YTKNS_SFM_PATH'))
@@ -18,33 +14,38 @@ $semaphore = sem_get($ftok, 1);
 if(!sem_acquire($semaphore))
     die('Failed to acquire semaphore.' . PHP_EOL);
 
-require_once __DIR__ . '/startup.php';
+try {
+    require_once __DIR__ . '/startup.php';
 
-// Destroy old sessions
-UserSession::purge();
+    // Prevent running cron script during maintenance
+    if(!YTKNS_MAINTENANCE) {
+        // Destroy old sessions
+        UserSession::purge();
 
-// Resynchronise use counts
-Upload::resync(EFFECT_UPLOADS);
+        // Resynchronise use counts
+        Upload::resync(EFFECT_UPLOADS);
 
-// Destroy orphaned uploads
-Upload::purgeOrphans();
+        // Destroy orphaned uploads
+        Upload::purgeOrphans();
 
-// Get task queue
-$taskQueue = ZoneTask::queue();
+        // Get task queue
+        $taskQueue = ZoneTask::queue();
 
-// Plow through tasks
-// TODO: make task functions modular
-while($task = array_shift($taskQueue)) {
-    if(!isset($zoneInfo) || $zoneInfo->getId() !== $task->getZoneId())
-        $zoneInfo = $task->getZone();
+        // Plow through tasks
+        // TODO: make task functions modular
+        while($task = array_shift($taskQueue)) {
+            if(!isset($zoneInfo) || $zoneInfo->getId() !== $task->getZoneId())
+                $zoneInfo = $task->getZone();
 
-    switch($task->getName()) {
-        case 'screenshot':
-            $zoneInfo->takeScreenshot();
-            break;
+            switch($task->getName()) {
+                case 'screenshot':
+                    $zoneInfo->takeScreenshot();
+                    break;
+            }
+
+            $task->delete();
+        }
     }
-
-    $task->delete();
+} finally {
+    sem_release($semaphore);
 }
-
-sem_release($semaphore);