diff --git a/tree.c b/tree.c
index a65cefe..acd0a2a 100644
--- a/tree.c
+++ b/tree.c
@@ -54,7 +54,7 @@ void add(struct node **tab_ptr_tree, wchar_t val[],int taille, int fl)
 int size(wchar_t val[])
 {
   int cpt = 0;
-  while(val[cpt]!='\0')
+  while(val!= NULL && val[cpt]!='\0')
     {
       cpt++;
     }
@@ -216,4 +216,4 @@ int split_text(dico Dico,wchar_t message[], wchar_t separateur[])
   if(buffer!=NULL)err += split_text(Dico,buffer,separateur);
 
   return err;
-}
\ No newline at end of file
+}
--
libgit2 0.21.2