diff --git a/src/corelib/serialization/qjson.cpp b/src/corelib/serialization/qjson.cpp
index c5e9eb70e1..592f6168dc 100644
--- a/src/corelib/serialization/qjson.cpp
+++ b/src/corelib/serialization/qjson.cpp
@@ -351,8 +351,6 @@ bool Value::isValid(const Base *b) const
         return false;
 
     int s = usedStorage(b);
-    if (!s)
-        return true;
     if (s < 0 || s > (int)b->tableOffset - offset)
         return false;
     if (type == QJsonValue::Array)
diff --git a/tests/auto/corelib/serialization/json/invalidBinaryData/40.json b/tests/auto/corelib/serialization/json/invalidBinaryData/40.json
new file mode 100644
index 0000000000..277096f8cb
Binary files /dev/null and b/tests/auto/corelib/serialization/json/invalidBinaryData/40.json differ