diff --git a/cronjobs/pplns_payout.php b/cronjobs/pplns_payout.php
index f5d6f24c..d95af481 100755
--- a/cronjobs/pplns_payout.php
+++ b/cronjobs/pplns_payout.php
@@ -51,7 +51,7 @@ foreach ($aAllBlocks as $iIndex => $aBlock) {
     $pplns_target = $config['pplns']['shares']['default'];
   }
 
-  if (!$aBlock['accounted']) {
+  if (!$aBlock['accounted'] && $aBlock['height'] > $setting->getValue('last_accounted_block_height')) {
     $iPreviousShareId = @$aAllBlocks[$iIndex - 1]['share_id'] ? $aAllBlocks[$iIndex - 1]['share_id'] : 0;
     $iCurrentUpstreamId = $aBlock['share_id'];
     if (!is_numeric($iCurrentUpstreamId)) {
@@ -183,6 +183,8 @@ foreach ($aAllBlocks as $iIndex => $aBlock) {
       $log->logFatal("Failed to delete accounted shares from $iPreviousShareId to $iCurrentUpstreamId, aborting!");
       exit(1);
     }
+    // Store this blocks height as last accounted for
+    $setting->setValue('last_accounted_block_height', $aBlock['height']);
     // Mark this block as accounted for
     if (!$block->setAccounted($aBlock['id'])) {
       $log->logFatal("Failed to mark block as accounted! Aborting!");
@@ -191,6 +193,22 @@ foreach ($aAllBlocks as $iIndex => $aBlock) {
       $monitoring->setStatus($cron_name . "_status", "okerror", 1); 
       exit(1);
     }
+  } else {
+    $aMailData = array(
+      'email' => $setting->getValue('website_email'),
+      'subject' => 'Payout processing aborted',
+      'Error' => 'Potential double payout detected. All payouts halted until fixed!',
+      'BlockID' => $aBlock['id'],
+      'Block Height' => $aBlock['height'],
+      'Block Share ID' => $aBlock['share_id']
+    );
+    if (!$mail->sendMail('notifications/error', $aMailData))
+      $log->logError("    Failed sending notifications: " . $notification->getError() . "\n");
+    $log->logFatal('Potential double payout detected. Aborted.');
+    $monitoring->setStatus($cron_name . "_active", "yesno", 0);
+    $monitoring->setStatus($cron_name . "_message", "message", "Block height for block too low! Potential double payout detected.");
+    $monitoring->setStatus($cron_name . "_status", "okerror", 1);
+    exit(1);
   }
 }
 
diff --git a/cronjobs/proportional_payout.php b/cronjobs/proportional_payout.php
index e6e76113..31a24beb 100755
--- a/cronjobs/proportional_payout.php
+++ b/cronjobs/proportional_payout.php
@@ -45,7 +45,7 @@ $count = 0;
 // Table header for account shares
 $log->logInfo("ID\tUsername\tValid\tInvalid\tPercentage\tPayout\t\tDonation\tFee");
 foreach ($aAllBlocks as $iIndex => $aBlock) {
-  if (!$aBlock['accounted']) {
+  if (!$aBlock['accounted'] && $aBlock['height'] > $setting->getValue('last_accounted_block_height')) {
     $iPreviousShareId = @$aAllBlocks[$iIndex - 1]['share_id'] ? $aAllBlocks[$iIndex - 1]['share_id'] : 0;
     $iCurrentUpstreamId = $aBlock['share_id'];
     $aAccountShares = $share->getSharesForAccounts($iPreviousShareId, $aBlock['share_id']);
@@ -82,7 +82,7 @@ foreach ($aAllBlocks as $iIndex => $aBlock) {
         number_format($aData['percentage'], 8) . "\t" .
         number_format($aData['payout'], 8) . "\t" .
         number_format($aData['donation'], 8) . "\t" .
-        number_format($aData['fee']), 8);
+        number_format($aData['fee'], 8));
 
       // Update user share statistics
       if (!$statistics->updateShareStatistics($aData, $aBlock['id']))
@@ -111,6 +111,8 @@ foreach ($aAllBlocks as $iIndex => $aBlock) {
       $monitoring->setStatus($cron_name . "_status", "okerror", 1); 
       exit(1);
     }
+    // Add block as accounted for into settings table
+    $setting->setValue('last_accounted_block_height', $aBlock['height']);
     // Mark this block as accounted for
     if (!$block->setAccounted($aBlock['id'])) {
       $log->logFatal('Failed to mark block as accounted! Aborted.');
@@ -119,7 +121,24 @@ foreach ($aAllBlocks as $iIndex => $aBlock) {
       $monitoring->setStatus($cron_name . "_status", "okerror", 1); 
       exit(1);
     }
+  } else {
+    $log->logFatal('Possible double payout detected. Aborted.');
+    $aMailData = array(
+      'email' => $setting->getValue('website_email'),
+      'subject' => 'Payout Failure: Double Payout',
+      'Error' => 'Possible double payout detected',
+      'BlockID' => $aBlock['id'],
+      'Block Height' => $aBlock['height'],
+      'Block Share ID' => $aBlock['share_id']
+    );
+    if (!$mail->sendMail('notifications/error', $aMailData))
+      $log->logError("    Failed sending notifications: " . $notification->getError() . "\n");
+    $monitoring->setStatus($cron_name . "_active", "yesno", 0);
+    $monitoring->setStatus($cron_name . "_message", "message", 'Possible double payout detected. Aborted.');
+    $monitoring->setStatus($cron_name . "_status", "okerror", 1);
+    exit(1);
   }
+  exit;
 }
 
 require_once('cron_end.inc.php');
diff --git a/public/templates/mail/notifications/error.tpl b/public/templates/mail/notifications/error.tpl
new file mode 100644
index 00000000..9aab79bf
--- /dev/null
+++ b/public/templates/mail/notifications/error.tpl
@@ -0,0 +1,10 @@
+<html>
+<body>
+<h1>An error occured!</h1>
+<p>This should never happen. Please review the error output below.</p>
+
+{foreach from=$DATA key=text item=message}
+  {if $text != 'email' && $text != 'subject'}
+    <p>{$text}: {$message}</p>
+  {/if}
+{/foreach}