diff --git a/lib/tcpdf/tcpdf.php b/lib/tcpdf/tcpdf.php
index b31e58bb2..4074dad33 100644
--- a/lib/tcpdf/tcpdf.php
+++ b/lib/tcpdf/tcpdf.php
@@ -19748,7 +19748,7 @@ Putting 1 is equivalent to putting 0 and calling Ln() just after. Default value:
 				break;
 			}
 			case 'a': {
-				$this->HREF = '';
+				$this->HREF = array();
 				break;
 			}
 			case 'sup': {