---
title: "how to fix the hubl unclosed block error in hubspot"
url: https://codefmt.dev/blog/hubl-unclosed-block-error
sources:
  - https://codefmt.dev/blog/hubl-unclosed-block-error
licence: "© codefmt. Cite with attribution to https://codefmt.dev."
---

# how to fix the hubl unclosed block error in hubspot

by [josh ozuna](/about) · codefmt

published June 10, 2026

the HubL unclosed block error means a paired tag like `{% if %}`, `{% for %}`, or `{% block %}` was opened but never closed with its `end` tag. to find it fast, paste the template into the [codefmt HubL linter](/hubl): the `hubl/unclosed-block`rule reports the exact line and column of the opener that's missing its closer, so you fix the tag instead of hunting through the file.

## what the error looks like in hubspot

HubSpot validates templates when you publish from the design manager or upload through the CLI. with an unclosed block, the template fails with a syntax error, and the engine usually points at the end of the file rather than the tag you forgot. it only discovers the problem once it runs out of input while still expecting a closer. in a long template with nested loops and conditionals, that makes the report nearly useless for locating the actual bug.

## why it happens

every paired HubL tag must be closed explicitly: `{% if %}` with `{% endif %}`, `{% for %}` with `{% endfor %}`, `{% block %}` with `{% endblock %}`. the usual causes:

* deep nesting: a conditional inside a loop inside a block, and one closer gets lost during an edit
* the implied-close trap: html lets some elements close implicitly (a new `<li>` ends the previous one, a block element ends an open `<p>`), so it's easy to assume template tags are just as forgiving. HubL block tags never imply a close
* copy-paste edits that bring an opener along without its closer, or delete a closer while trimming markup
* a closer that exists but closes the wrong tag, like `{% endif %}` where the open block is a loop

## find the unclosed tag in seconds

1. copy the failing template out of the design manager and paste it into the [codefmt HubL formatter and linter](/hubl).
2. read the diagnostics. an unclosed loop reports `'for' block opened here is never closed - expected 'endfor'` at the opener's own line, not the end of the file.
3. a missing `{% endblock %}` is reported separately by `hubl/missing-endblock`, which ships a one-click safe fix that appends the closer for you.
4. if a closer exists but pairs with the wrong opener, `hubl/mismatched-block` names both tags and the line where the open block started.

all three are error-severity rules in the linter's correctness and inheritance categories; the [rule reference](/hubl-lint-rules#unclosed-block) documents each one alongside the rest of the 28-rule catalog.

## fix it

once the linter points at the opener, the fix is mechanical: add the matching closer where the block should end, keeping the nesting order intact. closers must unwind in reverse order of the openers, so a loop opened inside a conditional closes before the `{% endif %}`. when the diagnostics are clean, format the template and paste it back into HubSpot. indentation from the formatter makes block boundaries visible, which is the best protection against reintroducing the bug on the next edit.

unclosed blocks are one of the most common HubL publish failures, but they're only one class. the [HubSpot CMS linter](/hubspot-cms-linter) guide covers the rest of what the 28 rules catch, from unknown filters to deprecated tags.

## frequently asked questions

what does the hubl unclosed block error mean?

a paired HubL tag like {% if %}, {% for %}, {% block %}, or {% macro %} was opened but its closer (endif, endfor, endblock, endmacro) never appears. HubSpot can't render the template until every opener has a matching closer.

why does hubspot point at the wrong line?

the template engine only knows a block is unclosed once it reaches the end of the file, so the error often surfaces at the last line instead of the tag you forgot to close. codefmt's hubl/unclosed-block rule reports the line and column of the opener itself, which is where the fix goes.

do hubl tags close themselves like html tags?

no. html lets some elements close implicitly (a new li ends the previous one, a block element ends an open p), so it's easy to assume templates are just as forgiving. HubL block tags never imply a close: every {% if %} needs {% endif %}, every {% for %} needs {% endfor %}, no exceptions.

can the unclosed block error be fixed automatically?

for {% block %} it can: codefmt's hubl/missing-endblock rule ships a one-click safe fix that appends {% endblock %}. for other openers the linter reports the exact opener line so you decide where the closer belongs, because inserting it in the wrong place would silently change your template's logic.

primary source: [HubSpot: HubL syntax reference](https://developers.hubspot.com/docs/cms/reference/hubl/overview)