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Parsing from a std::istream crashed in two unusual but valid stream states, both in input_stream_adapter: - With eofbit in the stream's exceptions() mask, get_character() sets eofbit via is->clear(), which throws std::ios_base::failure. While that exception unwinds, ~input_stream_adapter() called clear() again to reset eofbit, which is still set and still in the exception mask, so it throws a second time out of the (implicitly noexcept) destructor and std::terminate() is called. The destructor now only calls clear() if a bit other than eofbit remains set, so the first exception can propagate normally. - For an std::istream without a stream buffer (rdbuf() == nullptr, e.g. std::istream(nullptr)), the constructor stored the null pointer without checking it, and get_character() dereferenced it. input_adapter(std::istream&) now throws parse_error.101 for such a stream, the same as it already does for a null FILE* or char*. Added regression tests to unit-deserialization.cpp and, for the JSON_PRECISE_STREAM_POSITION variant of get_character(), to unit-precise-stream-position.cpp; both crashed before this fix. Documented the two exceptions in parse.md and operator_gtgt.md. Fixes #5646. Signed-off-by: Niels Lohmann <mail@nlohmann.me> Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>