diff --git a/core/mui/cairo_miracle_painter.rb b/core/mui/cairo_miracle_painter.rb
index bd9e1eb..d7bb533 100644
--- a/core/mui/cairo_miracle_painter.rb
+++ b/core/mui/cairo_miracle_painter.rb
@@ -237,15 +237,15 @@ class Gdk::MiraclePainter < Gtk::Object
     textselector_unselect end
 
   def iob_icon_pixbuf
-    [ ["reply.png".freeze, message.user.verified? ? "verified.png" : "etc.png"],
-      [if message.user.protected?; then "protected.png".freeze else "retweet.png".freeze end,
+    [ ["reply.png".freeze, (message.respond_to?(:user) && message.user.verified?) ? "verified.png" : "etc.png"],
+      [if message.respond_to?(:user) && message.user.protected?; then "protected.png".freeze else "retweet.png".freeze end,
        message.favorite? ? "unfav.png".freeze : "fav.png".freeze] ] end
 
   def iob_icon_pixbuf_off
     world, = Plugin.filtering(:world_current, nil)
     [ [(UserConfig[:show_replied_icon] and message.mentioned_by_me? and "reply.png".freeze),
-       UserConfig[:show_verified_icon] && message.user.verified? && "verified.png"],
-      [ if UserConfig[:show_protected_icon] and message.user.protected?
+       UserConfig[:show_verified_icon] && message.respond_to?(:user) && message.user.verified? && "verified.png"],
+      [ if UserConfig[:show_protected_icon] and message.respond_to?(:user) and message.user.protected?
           "protected.png".freeze
         elsif Plugin[:miracle_painter].shared?(message, world)
           "retweet.png".freeze end,
@@ -390,11 +390,15 @@ class Gdk::MiraclePainter < Gtk::Object
     layout end
 
   def header_left_markup
-    user = message.user
-    if user.respond_to?(:idname)
-      Pango.parse_markup("<b>#{Pango.escape(user.idname)}</b> #{Pango.escape(user.name || '')}")
+    if message.respond_to?(:user)
+      user = message.user
+      if user.respond_to?(:idname)
+        Pango.parse_markup("<b>#{Pango.escape(user.idname)}</b> #{Pango.escape(user.name || '')}")
+      else
+        Pango.parse_markup(Pango.escape(user.name || ''))
+      end
     else
-      Pango.parse_markup(Pango.escape(user.name || ''))
+      Pango.parse_markup(Pango.escape(''))
     end
   end
 
@@ -434,7 +438,7 @@ class Gdk::MiraclePainter < Gtk::Object
 
   # アイコンのpixbufを返す
   def main_icon
-    @main_icon ||= message.user.icon.load_pixbuf(width: icon_width, height: icon_height){|pixbuf|
+    @main_icon ||= message.icon.load_pixbuf(width: icon_width, height: icon_height){|pixbuf|
       @main_icon = pixbuf
       on_modify
     }
diff --git a/core/mui/cairo_sub_parts_message_base.rb b/core/mui/cairo_sub_parts_message_base.rb
index 1e77ea0..24a80b1 100644
--- a/core/mui/cairo_sub_parts_message_base.rb
+++ b/core/mui/cairo_sub_parts_message_base.rb
@@ -40,11 +40,15 @@ class Gdk::SubPartsMessageBase < Gdk::SubParts
   # [Pango::FontDescription] フォント情報
   # [Pango::Attribute] マークアップ情報
   def header_left_content(message)
-    user = message.user
-    if message.user[:idname]
-      attr_list, text = Pango.parse_markup("<b>#{Pango.escape(user.idname)}</b> #{Pango.escape(user.name || '')}")
+    if message.respond_to?(:user)
+      user = message.user
+      if message.user[:idname]
+        attr_list, text = Pango.parse_markup("<b>#{Pango.escape(user.idname)}</b> #{Pango.escape(user.name || '')}")
+      else
+        attr_list, text = Pango.parse_markup(Pango.escape(user.name || ''))
+      end
     else
-      attr_list, text = Pango.parse_markup(Pango.escape(user.name || ''))
+      attr_list, text = Pango.parse_markup(Pango.escape(''))
     end
     return text, header_left_font(message), attr_list
   end
@@ -445,7 +449,7 @@ class Gdk::SubPartsMessageBase < Gdk::SubParts
       context.paint end end
 
   def main_icon(message)
-    message.user.icon.load_pixbuf(width: icon_size.width, height: icon_size.width){ helper.on_modify }
+    message.icon.load_pixbuf(width: icon_size.width, height: icon_size.width){ helper.on_modify }
   end
 
   # 表示する際に本文に適用すべき装飾オブジェクトを作成する