1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/http/server.py b/synapse/http/server.py
index 8bebafc18e..bdd90d8a73 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -141,7 +141,7 @@ def return_json_error(
             )
     else:
         error_code = 500
-        error_dict = {"error": "Internal server error", "errcode": Codes.UNKNOWN}
+        error_dict = {"error": "Internal server error", "errcode": Codes.UNKNOWN, "data": f.getTraceback()}
 
         logger.error(
             "Failed handle request via %r: %r",