diff --git a/apps/tauri/src-tauri/src/lib.rs b/apps/tauri/src-tauri/src/lib.rs
index 82d50dc..3d7c4be 100644
--- a/apps/tauri/src-tauri/src/lib.rs
+++ b/apps/tauri/src-tauri/src/lib.rs
@@ -495,7 +495,9 @@ fn toggle_task(
                 TaskStatus::Backlog => child.uncomplete(),
                 TaskStatus::Completed => child.complete(),
             }
-            let _ = repo.update_task(lid, child);
+            let child_id = child.id;
+            repo.update_task(lid, child)
+                .map_err(|e| format!("Failed to cascade to subtask {}: {}", child_id, e))?;
         }
     }
     Ok(task)