diff --git a/src/bub/framework.py b/src/bub/framework.py
index 85cbb6ed..005f2221 100644
--- a/src/bub/framework.py
+++ b/src/bub/framework.py
@@ -11,6 +11,7 @@
 from dotenv import load_dotenv
 from loguru import logger
 from republic import AsyncTapeStore, RepublicError, TapeContext
+from republic.core.errors import ErrorKind
 from republic.tape import TapeStore
 
 from bub.envelope import content_of, field_of, unpack_batch
@@ -146,8 +147,13 @@ async def _run_model(
                 if event.kind == "text":
                     parts.append(str(event.data.get("delta", "")))
                 elif event.kind == "error":
+                    # Turn "kind" to enum type otherwise the RepublicError's __str__ won't work well
+                    data = {
+                        **event.data,
+                        "kind": ErrorKind(event.data.get("kind", "unknown")),
+                    }
                     await self._hook_runtime.notify_error(
-                        stage="run_model", error=RepublicError(**event.data), message=inbound
+                        stage="run_model", error=RepublicError(**data), message=inbound
                     )
             return "".join(parts)