0 Using $this when not in object context - BUG

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.3
-- PHP version -- : 7.0.11
-- Error-message(debug-mod must be tuned on) -- : 0 Using $this when not in object context

Hi guys,
Joomla 3.6.3 + AcyMailing Enterprise 5.5.0 + HikaShop business 2.6.4 on PHP 7.0.11
Editing an old AcyMailing Newsletter > Previw / Send > ... :

An error has occurred.
0 Using $this when not in object context

I avoid the error changing PHP 7.0.11 with PHP 5.6.26
PS I don't have back the error with all newsletters, but just with the ones with ID: 11 / 12 / 13 / 14 / 15 / 29 / 30 / 43 / 47
I asked to my host to give me the logs file...

From my log error server I have back:

[18-Oct-2016 16:29:42 America/Panama] PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; plgAcymailingHikashop has a deprecated constructor in /home/public_html/myJoomla/plugins/acymailing/hikashop/hikashop.php on line 12
[18-Oct-2016 16:29:42 America/Panama] PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; plgAcymailingusergroup has a deprecated constructor in /home/public_html/myJoomla/plugins/acymailing/usergroup/usergroup.php on line 3

Hi Nicolas,
PHP 7.0.11
Debug System: activated
Error Reporting: Maximum
here my AcyMailing report

Call stack # Function Location
1 JApplicationCms->execute() .../administrator/index.php:51
2 JApplicationAdministrator->doExecute() .../libraries/cms/application/cms.php:261
3 JApplicationAdministrator->dispatch() .../libraries/cms/application/administrator.php:152
4 JComponentHelper::renderComponent() .../libraries/cms/application/administrator.php:98
5 JComponentHelper::executeComponent() .../libraries/cms/component/helper.php:380
6 require_once() .../libraries/cms/component/helper.php:405
7 JControllerLegacy->execute() .../administrator/components/com_acymailing/acymailing.php:82
8 NewsletterController->savepreview() .../libraries/legacy/controller/legacy.php:702
9 NewsletterController->preview() .../administrator/components/com_acymailing/controllers/newsletter.php:101
10 JControllerLegacy->display() .../administrator/components/com_acymailing/controllers/newsletter.php:115
11 NewsletterViewNewsletter->display() .../libraries/legacy/controller/legacy.php:664
12 NewsletterViewNewsletter->preview() .../administrator/components/com_acymailing/views/newsletter/view.html.php:24
13 acymailerHelper->load() .../administrator/components/com_acymailing/views/newsletter/view.html.php:578
14 acymailerHelper->triggerTagsWithRightLanguage() .../administrator/components/com_acymailing/helpers/acymailer.php:288
15 JEventDispatcher->trigger() .../administrator/components/com_acymailing/helpers/acymailer.php:771
16 JEvent->update() .../libraries/joomla/event/dispatcher.php:159
17 plgAcymailingSeblod->acymailing_replacetags() .../libraries/joomla/event/event.php:69
18 plgAcymailingSeblod->_replaceOne() .../plugins/acymailing/seblod/seblod.php:560
19 plgAcymailingSeblod->_replaceContent() .../plugins/acymailing/seblod/seblod.php:594
20 AcyplgContentCCK::onContentPrepare() .../plugins/acymailing/seblod/seblod.php:672
21 AcyplgContentCCK::_prepare() .../plugins/acymailing/seblod/acyseblodfield.php:14

Hi Nicolas,
sorry for the delay, Yes, I can confirm, problem was from AcyMailing and it is been solved...