From 4c85aad17294afd73d5f4ff2a6c4deed48f8fee5 Mon Sep 17 00:00:00 2001
From: Shahmir Varqha <sham9871@gmail.com>
Date: Wed, 15 Apr 2026 12:29:22 +0800
Subject: [PATCH] add warning log

---
 marimo/_output/formatters/altair_formatters.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/marimo/_output/formatters/altair_formatters.py b/marimo/_output/formatters/altair_formatters.py
index 7e308bfd5e5..bac5dbd23f1 100644
--- a/marimo/_output/formatters/altair_formatters.py
+++ b/marimo/_output/formatters/altair_formatters.py
@@ -48,8 +48,8 @@ def _show_chart(chart: AltairChartType) -> tuple[KnownMimeType, str]:
             mimebundle: MimeBundle | tuple[MimeBundle, MimeBundle] = {}
             try:
                 mimebundle = chart._repr_mimebundle_() or {}  # type: ignore
-            except Exception:
-                pass
+            except Exception as e:
+                LOGGER.warning("Failed to get mimebundle from chart: %s", e)
 
             # When the mimebundle is a tuple, it follows the format
             # (data_dict, metadata_dict).