diff --git a/src/UnexpectedError.tsx b/src/UnexpectedError.tsx
index aa7f468..906d99d 100644
--- a/src/UnexpectedError.tsx
+++ b/src/UnexpectedError.tsx
@@ -18,7 +18,16 @@ const UnexpectedError: Component<{ error?: any }> = (props) => {
             .join("\n");
           return `${err.name}: ${err.message}\n${strackMsg}`;
         } catch (reason) {
-          return `<failed to build the stacktrace of "${err}"...>\n${reason}`;
+          return `<failed to build the stacktrace of "${err}"...>\n${reason}\n${JSON.stringify(
+            {
+              name: err.name,
+              stack: err.stack,
+              cause: err.cause,
+              message: err.message,
+            },
+            undefined,
+            2,
+          )}`;
         }
       }