diff --git a/crates/copilot/src/copilot.rs b/crates/copilot/src/copilot.rs
index a1bbc26b9c44d0f68e120a10bf11d0f3cae19d73..179e217d207554bcf226ce905aa9226c1c334b72 100644
--- a/crates/copilot/src/copilot.rs
+++ b/crates/copilot/src/copilot.rs
@@ -1035,10 +1035,9 @@ impl Copilot {
         };
         let buffer_entity = buffer.clone();
         let lsp = server.lsp.clone();
-        let registered_buffer = server
-            .registered_buffers
-            .get_mut(&buffer.entity_id())
-            .unwrap();
+        let Some(registered_buffer) = server.registered_buffers.get_mut(&buffer.entity_id()) else {
+            return Task::ready(Err(anyhow::anyhow!("buffer not registered")));
+        };
         let pending_snapshot = registered_buffer.report_changes(buffer, cx);
         let buffer = buffer.read(cx);
         let uri = registered_buffer.uri.clone();