# Demux summarize: TypeError: len() of unsized object

**URL:** https://forum.qiime2.org/t/demux-summarize-typeerror-len-of-unsized-object/780
**Category:** User Support
**Tags:** demux
**Created:** [June 30, 2017, 2:42pm UTC](https://forum.qiime2.org/t/demux-summarize-typeerror-len-of-unsized-object/780 "2017-06-30T14:42:52Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![thermokarst](https://forum.qiime2.org/letter_avatar_proxy/v4/letter/t/8e7dd6/32.png) [@thermokarst](https://forum.qiime2.org/u/thermokarst)
#### Post date: [June 30, 2017, 4:42pm UTC](https://forum.qiime2.org/t/demux-summarize-typeerror-len-of-unsized-object/780/3 "2017-06-30T16:42:00Z")

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> [@wangj50](#):
>
> I wish this is written in some help doc. Thanks!

Hi @wangj50 --- we generally don't write up [user documents](https://docs.qiime2.org) detailing workaround for bugs, we would rather see those bugs fixed up! As a general note, our [issue trackers](https://github.com/qiime2/q2-demux/issues) are where we track the status of [bugs](https://github.com/qiime2/q2-demux/issues/49). Fortunately for you, the issue that was linked to in the [post](https://forum.qiime2.org/t/trouble-import-demuxed-samples-with-underscores/742/3) you referenced above has been fixed, and should be available in the next release of QIIME 2 (2017.7). This bug fix removes the need to strip all underscores from sample IDs. Thanks!

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