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-rw-r--r--packages/gitbook-markdown/lib/summary.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/packages/gitbook-markdown/lib/summary.js b/packages/gitbook-markdown/lib/summary.js
index 2cb31be..77284cf 100644
--- a/packages/gitbook-markdown/lib/summary.js
+++ b/packages/gitbook-markdown/lib/summary.js
@@ -103,6 +103,7 @@ function parseTitle(src) {
function parseChapter(nodes) {
var node = _.first(nodes);
if (!node) return null;
+ if (!node.text) throw new Error("Invalid entry in the SUMMARY");
return _.extend(parseTitle(node.text), {
articles: _.chain(listSplit(filterList(nodes), 'list_item_start', 'list_item_end'))