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-rw-r--r--mail/em-format-html-display.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/mail/em-format-html-display.c b/mail/em-format-html-display.c
index 199ff19b67..3985b96ec7 100644
--- a/mail/em-format-html-display.c
+++ b/mail/em-format-html-display.c
@@ -2446,7 +2446,12 @@ efhd_format_optional(EMFormat *emf, CamelStream *fstream, CamelMimePart *part, C
{
char *classid, *html;
struct _attach_puri *info;
- CamelStream *stream = ((CamelStreamFilter *) fstream)->source;
+ CamelStream *stream;
+
+ if (CAMEL_IS_STREAM_FILTER (fstream) && ((CamelStreamFilter *) fstream)->source)
+ stream = ((CamelStreamFilter *) fstream)->source;
+ else
+ stream = fstream;
classid = g_strdup_printf("optional%s", emf->part_id->str);
info = (struct _attach_puri *)em_format_add_puri(emf, sizeof(*info), classid, part, efhd_attachment_frame);