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-rw-r--r--railties/lib/rails/templates/rails/mailers/email.html.erb2
1 files changed, 1 insertions, 1 deletions
diff --git a/railties/lib/rails/templates/rails/mailers/email.html.erb b/railties/lib/rails/templates/rails/mailers/email.html.erb
index afca6368d5..a5f105de8d 100644
--- a/railties/lib/rails/templates/rails/mailers/email.html.erb
+++ b/railties/lib/rails/templates/rails/mailers/email.html.erb
@@ -103,7 +103,7 @@
</dl>
</header>
-<% if @part.mime_type %>
+<% if @part && @part.mime_type %>
<iframe seamless name="messageBody" src="?part=<%= Rack::Utils.escape(@part.mime_type) %>"></iframe>
<% else %>
<p>