diff --git a/classes/Database/PDO/Common.php b/classes/Database/PDO/Common.php
index 6e0353d..5df3936 100644
--- a/classes/Database/PDO/Common.php
+++ b/classes/Database/PDO/Common.php
@@ -157,7 +157,10 @@ class Database_PDO_Common extends Database_Common
 
 			foreach ($backtrace as $file)
 			{
-				$files[] = $file['class'] . ':' . $file['line'];
+				if (isset($file['class']))
+				{
+					$files[] = $file['class'] . ':' . $file['line'];
+				}
 			}
 
 			$sql .= "\n" . '/* [' . implode('|', $files) . '] */';
diff --git a/jar.php b/jar.php
index 09cb243..ce6adaf 100755
--- a/jar.php
+++ b/jar.php
@@ -1970,7 +1970,10 @@ class Database_PDO_Common extends Database_Common
 
 			foreach ($backtrace as $file)
 			{
-				$files[] = $file['class'] . ':' . $file['line'];
+				if (isset($file['class']))
+				{
+					$files[] = $file['class'] . ':' . $file['line'];
+				}
 			}
 
 			$sql .= "\n" . '/* [' . implode('|', $files) . '] */';