By default, only dictionary objects can be serialized in Django JSON-encoded response. Before ECMASCript 5, serializing non-dictionary objects could lead to security vulnerabilities. Since most modern browsers implement ECMAScript 5, this vector of attack is no longer a threat and it is possible to serialize non-dictionary objects by setting the `safe` flag to `False`. However, if this flag is not set, a `TypeError` will be thrown by the serializer.
Despite this possibility, it is still recommended to serialize dictionary objects, as an API based on `dict` is generally more extensible and easier to maintain.
== How to fix it
To fix this issue, developers should ensure that the safe flag is set to "False" when attempting to serialize non-dictionary objects in Django.