CrossRefExportPlugin blank page

Hi @asmecher and @ctgraham

I am using OJS in version 2.4.8.3. And I am trying to use the CROSSREF XML EXPORT MODULE, to manage the DOI, but clicking on it takes me to a blank page in a 500 error. And it is only in a journal.
This is the error that generates

 NOTICE: Undefined offset: 10 (/home/www/revistas/plugins/importexport/crossref/classes/PubObjectCache.inc.php:81)

ojs2 has produced an error Message: WARNING: assert(): Assertion failed In file: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/DOIExportPlugin.inc.php
 At line: 1328
 Stacktrace: File: (unknown) line (unknown)
 Function: PKPApplication->errorHandler(2, "assert(): Assertion failed", "/var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/DOIExportPlugin.inc.php", 1328, Array(6)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/DOIExportPlugin.inc.php line 1328
 Function: assert(False) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/DOIExportPlugin.inc.php line 546
 Function: DOIExportPlugin->_getArticleIssue(Object(PublishedArticle), Object(Journal)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/CrossRefExportPlugin.inc.php line 219
 Function: DOIExportPlugin->getAllPublishedArticles(Object(Journal)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/DOIExportPlugin.inc.php line 174
 Function: CrossRefExportPlugin->displayArticleList(Object(TemplateManager), Object(Journal)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/pages/manager/ImportExportHandler.inc.php line 43
 Function: DOIExportPlugin->display(Array(0), Object(Request)) File: (unknown) line (unknown)
 Function: ImportExportHandler->importexport(Array(3), Object(Request)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/lib/pkp/classes/core/PKPRouter.inc.php line 362
 Function: call_user_func(Array(2), Array(3), Object(Request)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/lib/pkp/classes/core/PKPPageRouter.inc.php line 220
 Function: PKPRouter->_authorizeInitializeAndCallRequest(Array(2), Object(Request), Array(3), False) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/lib/pkp/classes/core/Dispatcher.inc.php line 134
 Function: PKPPageRouter->route(Object(Request)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/lib/pkp/classes/core/PKPApplication.inc.php line 178
 Function: Dispatcher->dispatch(Object(Request)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/index.php line 64
 Function: PKPApplication->execute() Server info: OS: Linux PHP Version: 5.6.40-0+deb8u8 Apache Version: Apache/2.4.10 (Debian) DB Driver: mysql DB server version: 10.0.38-MariaDB-0+deb8u1
ojs2 has produced an error Message: WARNING: assert(): Assertion failed In file: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/PubObjectCache.inc.php
 At line: 79
 Stacktrace: File: (unknown) line (unknown)
 Function: PKPApplication->errorHandler(2, "assert(): Assertion failed", "/var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/PubObjectCache.inc.php", 79, Array(3)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/PubObjectCache.inc.php line 79
 Function: assert(False) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/DOIExportPlugin.inc.php line 1334
 Function: PubObjectCache->get("issues", "10") File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/DOIExportPlugin.inc.php line 546
 Function: DOIExportPlugin->_getArticleIssue(Object(PublishedArticle), Object(Journal)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/CrossRefExportPlugin.inc.php line 219
 Function: DOIExportPlugin->getAllPublishedArticles(Object(Journal)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/DOIExportPlugin.inc.php line 174
 Function: CrossRefExportPlugin->displayArticleList(Object(TemplateManager), Object(Journal)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/pages/manager/ImportExportHandler.inc.php line 43
 Function: DOIExportPlugin->display(Array(0), Object(Request)) File: (unknown) line (unknown)
 Function: ImportExportHandler->importexport(Array(3), Object(Request)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/lib/pkp/classes/core/PKPRouter.inc.php line 362
 Function: call_user_func(Array(2), Array(3), Object(Request)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/lib/pkp/classes/core/PKPPageRouter.inc.php line 220
 Function: PKPRouter->_authorizeInitializeAndCallRequest(Array(2), Object(Request), Array(3), False) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/lib/pkp/classes/core/Dispatcher.inc.php line 134
 Function: PKPPageRouter->route(Object(Request)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/lib/pkp/classes/core/PKPApplication.inc.php line 178
 Function: Dispatcher->dispatch(Object(Request)) File: /var/www/html/site.aprendeenlinea.udea.edu.co/revistas/index.php line 64
 Function: PKPApplication->execute() Server info: OS: Linux PHP Version: 5.6.40-0+deb8u8 Apache Version: Apache/2.4.10 (Debian) DB Driver: mysql DB server version: 10.0.38-MariaDB-0+deb8u1
NOTICE: Undefined offset: 10 (/var/www/html/site.aprendeenlinea.udea.edu.co/revistas/plugins/importexport/crossref/classes/PubObjectCache.inc.php:81)

This error is describing a failure to find the Issue associated with a published article.

There may be some bad data which is causing this. If you know which article is triggering this, take a closer look at the issue assignment and related metadata. Do other articles in the same issue behave as expected?