diff --git a/src/parse.cpp b/src/parse.cpp
index 262536b..4cfab77 100644
--- a/src/parse.cpp
+++ b/src/parse.cpp
@@ -53,7 +53,7 @@ std::vector<Node> LoadAll(std::istream& input) {
   Parser parser(input);
   while (true) {
     NodeBuilder builder;
-    if (!parser.HandleNextDocument(builder)) {
+    if (!parser.HandleNextDocument(builder) || builder.Root().IsNull()) {
       break;
     }
     docs.push_back(builder.Root());