diff --git a/librerie/exercise3/binarytree/lnk/binarytreelnk.cpp b/librerie/exercise3/binarytree/lnk/binarytreelnk.cpp
index a14fe11..5b49da9 100755
--- a/librerie/exercise3/binarytree/lnk/binarytreelnk.cpp
+++ b/librerie/exercise3/binarytree/lnk/binarytreelnk.cpp
@@ -143,7 +143,8 @@ BinaryTreeLnk<Data>& BinaryTreeLnk<Data>::operator=(BinaryTreeLnk<Data>&& tree)
 template <typename Data>
 bool BinaryTreeLnk<Data>::operator==(const BinaryTreeLnk<Data>& tree) const noexcept{
   if(size == tree.size){
-    return (Root() == tree.Root());
+    if(size == 0) return true;
+    else return (Root() == tree.Root());
   }else{
     return false;
   }