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<div>Thank you for the comment!</div>
<div>I’ve checked the behavior and previous version does not indeed cover the case with box.NULL. Suitable fix and tests were added. <br>
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<blockquote style="border-left:1px solid #0857A6; margin:10px; padding:0 0 0 10px;">Четверг, 7 ноября 2019, 17:08 +03:00 от Бабин Олег <olegrok@tarantool.org>:<br>
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<div class="class_1573154769">Maria, thanks for your patch!<br>
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But as I see you don't consider the case of box.NULL that has 'cdata' type, but doesn't have<br>
__serialize metamethod.<br>
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It will lead to an error:<br>
```
<p class="p1_mailru_css_attribute_postfix"><span class="s1_mailru_css_attribute_postfix">- error: '[string "return x:__serialize()"]:1: ''void *'' has no member named ''__serialize'''</span></p>
<p class="p1_mailru_css_attribute_postfix"><span class="s1_mailru_css_attribute_postfix">...</span><br>
```</p>
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<blockquote data-mce-style="border-left-color: #0857a6;" style="border-left-color: #0857a6;"><span data-email="maria.khaydich@tarantool.org" data-name="Maria" data-quote-id="1689142405815888918" data-timestamp="1573134420" data-type="sender">Четверг, 7 ноября 2019, 16:47 +03:00 от Maria <<a href="/compose?To=maria.khaydich@tarantool.org">maria.khaydich@tarantool.org</a>>:</span>
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+ if type(res) == 'cdata' then<br>
+ results[n] = res:__serialize()<br>
+ end</div>
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-- <br>
Oleg Babin<br>
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<div>--<br>
Maria Khaydich</div>
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