# LibTmux.UnsupportedQueryExpressionException.Expression

- **Module:** LibTmux
- **Package:** LibTmux
- **Language:** C#
- **Kind:** property
- **Source:** https://github.com/libtmux/libtmux-dotnet/blob/cf34b255c896d19a97e7d7fabea58609c916012d/src/LibTmux/Exceptions/UnsupportedQueryExpressionException.cs#L36
- **Page:** https://libtmux.org/en/csharp/latest/reference/libtmux-unsupportedqueryexpressionexception-expression/

Gets the expression that could not be translated.

Empty when the refusal named no single expression.