diff --git a/clientSSE.go.tmpl b/clientSSE.go.tmpl
index 54eba7b..8875431 100644
--- a/clientSSE.go.tmpl
+++ b/clientSSE.go.tmpl
@@ -56,7 +56,7 @@ const sseResponse = async (
                 onError(
                     WebrpcClientAbortedError.new({
                         message: "AbortError",
-                        cause: `AbortError: ${error.message}`,
+                        cause: `AbortError: ${error instanceof Error ? error.message : String(error)}`,
                     }),
                     () => {
                         throw new Error("Abort signal cannot be used to reconnect")