--- /mnt/storage/scratch/rocko-r82-out/mutants-base/orig	2026-10-11 20:30:15.852477467 -0500
+++ scripts/mosaic-task.mjs	2026-10-11 20:30:19.101013234 -0500
@@ -479,7 +479,7 @@
     if (result) {
       if (typeof result.status === "string") status = result.status;
       if (typeof result.taskId === "string") taskId = result.taskId;
-      if (typeof result.workspace === "string") workspace = result.workspace;
+      workspace = String(result.workspace ?? "-");
       if (typeof result.session === "string") session = result.session;
     }
     process.stdout.write(`${runId}  ${status.padEnd(9)}  task=${taskId.padEnd(18)} ws=${workspace.padEnd(10)} session=${session}\n`);