diff --git a/crates/debugger_ui/src/debugger_panel.rs b/crates/debugger_ui/src/debugger_panel.rs
index 31f4808e56c31c10539a74c7ae1e817fd7c757d1..17418203856ef07c991229ccb249de288f80fc15 100644
--- a/crates/debugger_ui/src/debugger_panel.rs
+++ b/crates/debugger_ui/src/debugger_panel.rs
@@ -1119,7 +1119,7 @@ impl Panel for DebugPanel {
     }
 
     fn set_size(&mut self, size: Option<Pixels>, _window: &mut Window, _cx: &mut Context<Self>) {
-        self.size = size.unwrap();
+        self.size = size.unwrap_or(px(300.));
     }
 
     fn remote_id() -> Option<proto::PanelId> {