diff --git a/module/product/model.php b/module/product/model.php
index 10a3c47d53..09ca34936b 100755
--- a/module/product/model.php
+++ b/module/product/model.php
@@ -2039,7 +2039,7 @@ class productModel extends model
     {
         $updateTime = zget($this->app->config->global, 'productStatsTime', '');
         $now        = helper::now();
-        if(time() - strtotime($updateTime) < $this->config->product->refreshInterval && !$refreshAll) return;
+        if($updateTime && time() - strtotime($updateTime) < $this->config->product->refreshInterval && !$refreshAll) return;
 
         /*
          * If productStatsTime is before two weeks ago, refresh all products directly.
diff --git a/module/program/model.php b/module/program/model.php
index 439e55ca63..c319aa45cc 100644
--- a/module/program/model.php
+++ b/module/program/model.php
@@ -1323,7 +1323,7 @@ class programModel extends model
     {
         $updateTime = zget($this->app->config->global, 'projectStatsTime', '');
         $now        = helper::now();
-        if(time() - strtotime($updateTime) < $this->config->program->refreshInterval && !$refreshAll) return;
+        if($updateTime && time() - strtotime($updateTime) < $this->config->program->refreshInterval && !$refreshAll) return;
 
         /*
          * If projectStatsTime is before two weeks ago, refresh all executions directly.