3 files changed, 16 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'))
diff --git a/packages/gitbook-markdown/test/fixtures/SUMMARY_SUBLIST.md b/packages/gitbook-markdown/test/fixtures/SUMMARY_SUBLIST.md
new file mode 100644
index 0000000..9f21215
--- /dev/null
+++ b/packages/gitbook-markdown/test/fixtures/SUMMARY_SUBLIST.md
@@ -0,0 +1,6 @@
+# Summary
+
+* Test
+* 1. Landform
+
+
diff --git a/packages/gitbook-markdown/test/summary.js b/packages/gitbook-markdown/test/summary.js
index 98cd57f..a1bb49a 100644
--- a/packages/gitbook-markdown/test/summary.js
+++ b/packages/gitbook-markdown/test/summary.js
@@ -56,6 +56,15 @@ describe('Summary parsing', function () {
         assert.equal(l.chapters.length, 1);
     });
 
+    it('should throw error for sublist entries', function() {
+        assert.throws(
+            function() {
+                var l = lex('SUMMARY_SUBLIST.md');
+            },
+            "Invalid entry in the SUMMARY"
+        );
+    });
+
     it('should correctly convert it to text', function() {
         var text = summary.toText(LEXED);
         assertObjectsEqual(summary(text), LEXED);