diff --git a/web/src/state.rs b/web/src/state.rs
index de2c1b8..239f997 100644
--- a/web/src/state.rs
+++ b/web/src/state.rs
@@ -521,6 +521,8 @@ pub fn update(msg: Msg, model: &mut Model, orders: &mut impl Orders<Msg>) {
                 let end = r.height() - ih;
                 let y = -r.y();
                 orders.send_msg(Msg::SetProgress((y / end).max(0.)));
+            } else {
+                orders.send_msg(Msg::SetProgress(0.));
             }
         }
         Msg::SetProgress(ratio) => {