correction of variable name

application/controllers/Logbook.php

@@ -204,7 +204,7 @@ class Logbook extends CI_Controller {
 			}
 			if (isset($user_gridmap_confirmation) && strpos($user_gridmap_confirmation, 'E') !== false) {
 				if ($extrawhere!='') {
-					$extrawherei.=" OR";
+					$extrawhere.=" OR";
 				}
 				$extrawhere.=" COL_EQSL_QSL_RCVD='Y'";
 			}