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reference/constraints/Expression.rst
@@ -217,6 +217,13 @@ more about the expression language syntax, see
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// ...
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}
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+ .. caution::
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+
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+ In Symfony 2.4 and Symfony 2.5, if the property (e.g. ``isTechnicalPost``)
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+ were ``null``, the expression would never be called and the value
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+ would be seen as valid. To ensure that the value is not ``null``,
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+ use the :doc:`NotNull constraint </reference/constraints/NotNull>`.
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For more information about the expression and what variables are available
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to you, see the :ref:`expression <reference-constraint-expression-option>`
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option details below.
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