diff --git a/src/lexer.c b/src/lexer.c
index 49b74f5..16a8fef 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -3469,6 +3469,10 @@ static Node* GetTokenFromStream( TidyDocImpl* doc, GetTokenMode mode )
         return node;  /* the COMMENT token */
     }
 
+    /* check attributes before return NULL */
+    if (attributes)
+        TY_(FreeAttribute)( doc, attributes );
+
     DEBUG_LOG(SPRTF("Returning NULL...\n"));
     return NULL;
 }