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-rw-r--r--src/Components/Expression.php1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Components/Expression.php b/src/Components/Expression.php
index 4c2c04c..d91d902 100644
--- a/src/Components/Expression.php
+++ b/src/Components/Expression.php
@@ -186,6 +186,7 @@ class Expression extends Component
if (($token->type === Token::TYPE_KEYWORD)
&& ($token->flags & Token::FLAG_KEYWORD_RESERVED)
&& ($token->value !== 'DUAL')
+ && ($token->value !== 'NULL')
) {
// Keywords may be found only between brackets.
if ($brackets === 0) {