diff --git a/codepot/src/codepot/controllers/code.php b/codepot/src/codepot/controllers/code.php
index 03bec00e..5480b522 100644
--- a/codepot/src/codepot/controllers/code.php
+++ b/codepot/src/codepot/controllers/code.php
@@ -654,10 +654,14 @@ class Code extends Controller
 			for ($i = 0; $i < $history_count; $i++)
 			{
 				$h = $history[$i];
-				if (array_key_exists ($h['author'], $stats))
-					$stats[$h['author']]++;
-				else 
-					$stats[$h['author']] = 1;
+				if (array_key_exists ('author', $h))
+				{
+					$author = $h['author'];
+					if (array_key_exists ($author, $stats))
+						$stats[$author]++;
+					else 
+						$stats[$author] = 1;
+				}
 			}
 
 			$this->load->library ('PHPGraphLibPie', array ('width' => 400, 'height' => 300), 'graph');
@@ -673,10 +677,14 @@ class Code extends Controller
 			for ($i = 0; $i < $history_count; $i++)
 			{
 				$h = $history[$i];
-				if (array_key_exists ($h['author'], $stats))
-					$stats[$h['author']]++;
-				else 
-					$stats[$h['author']] = 1;
+				if (array_key_exists ('author', $h))
+				{
+					$author = $h['author'];
+					if (array_key_exists ($author, $stats))
+						$stats[$author]++;
+					else 
+						$stats[$author] = 1;
+				}
 			}
 
 			$this->load->library ('PHPGraphLib', array ('width' => 400, 'height' => 300), 'graph');