diff --git a/public/include/classes/statistics.class.php b/public/include/classes/statistics.class.php
index e832c742..d3d754cd 100644
--- a/public/include/classes/statistics.class.php
+++ b/public/include/classes/statistics.class.php
@@ -815,6 +815,9 @@ class Statistics extends Base {
       $dNetworkHashrate = 1;
       $dDifficulty = 1;
     }
+    if($dNetworkHashrate <= 0){
+      return $this->memcache->setCache(__FUNCTION__, $this->config['cointarget']);
+    }
 
     return $this->memcache->setCache(__FUNCTION__, pow(2, 32) * $dDifficulty / $dNetworkHashrate);
   }