diff --git a/tests/src/unit-bjdata.cpp b/tests/src/unit-bjdata.cpp
index 2e280ffd6..6ebc62996 100644
--- a/tests/src/unit-bjdata.cpp
+++ b/tests/src/unit-bjdata.cpp
@@ -2094,6 +2094,20 @@ TEST_CASE("BJData")
             CHECK(!json::sax_parse(v, &scp, json::input_format_t::bjdata));
         }
 
+        SECTION("key() in ndarray _ArrayType_")
+        {
+            std::vector<uint8_t> v = {'[', '$', 'U', '#', '[', '$', 'U', '#', 'i', 2, 2, 2, 1, 2, 3, 4};
+            SaxCountdown scp(9);
+            CHECK(!json::sax_parse(v, &scp, json::input_format_t::bjdata));
+        }
+
+        SECTION("key() in ndarray _ArrayType_")
+        {
+            std::vector<uint8_t> v = {'[', '$', 'U', '#', '[', '$', 'U', '#', 'i', 2, 2, 2, 1, 2, 3, 4};
+            SaxCountdown scp(10);
+            CHECK(!json::sax_parse(v, &scp, json::input_format_t::bjdata));
+        }
+
         SECTION("string() in ndarray _ArrayType_")
         {
             std::vector<uint8_t> v = {'[', '$', 'U', '#', '[', '$', 'i', '#', 'i', 2, 3, 2, 6, 5, 4, 3, 2, 1};