diff --git a/src/shared/prompt-logging/backends/sheets.ts b/src/shared/prompt-logging/backends/sheets.ts
index 6b2450f..187bd46 100644
--- a/src/shared/prompt-logging/backends/sheets.ts
+++ b/src/shared/prompt-logging/backends/sheets.ts
@@ -396,7 +396,7 @@ export const init = async (onStop: () => void) => {
     await loadIndexSheet(false);
     await writeIndexSheet();
   } catch (e) {
-    log.warn(e, "Could not load index sheet. Creating a new one.");
+    log.warn({ error: e.message }, "Could not load index sheet. Creating a new one.");
     await createIndexSheet();
   }
 };
diff --git a/src/shared/prompt-logging/log-queue.ts b/src/shared/prompt-logging/log-queue.ts
index 0e337d0..1b40228 100644
--- a/src/shared/prompt-logging/log-queue.ts
+++ b/src/shared/prompt-logging/log-queue.ts
@@ -69,7 +69,7 @@ export const start = async () => {
     log.info("Logging backend initialized.");
     started = true;
   } catch (e) {
-    log.error(e, "Could not initialize logging backend.");
+    log.error({ error: e.message }, "Could not initialize logging backend.");
     return;
   }
   scheduleFlush();