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-rw-r--r--org/output_xmls.org1
1 files changed, 1 insertions, 0 deletions
diff --git a/org/output_xmls.org b/org/output_xmls.org
index 793827e..a24e1e2 100644
--- a/org/output_xmls.org
+++ b/org/output_xmls.org
@@ -2369,6 +2369,7 @@ void outputEPub3(D,I)(
}
}
if (obj.is_a == "heading") {
+ assert(obj.text.length > 0);
if (obj.heading_lev_markup <= 4) {
oepbs_content_parts["manifest_documents"] ~=
format(q"ΒΆ <item id="%s.xhtml" href="%s.xhtml" media-type="application/xhtml+xml" />