diff --git a/src/Extractor/PdoExtractor.php b/src/Extractor/PdoExtractor.php
index d0b5f91..ea2c314 100644
--- a/src/Extractor/PdoExtractor.php
+++ b/src/Extractor/PdoExtractor.php
@@ -28,7 +28,7 @@ public function init()
         $res = $this->stmt->execute();
         if (!$res) {
             $arr = $this->stmt->errorInfo();
-            throw new RuntimeException($arr[2] . "\n" . $sql);
+            throw new RuntimeException($arr[2] . "\n" . $this->sql);
         }
     }