Remove php warning on nested taxonomies

I continue to get the errors I listed. But paging down through a huge redundant dump list of what I show the error saying, I actually find output in the display window at the end. Below I have pasted two views of what that output looks like [just part of what is a very extensive taxonomy to show the layout]. The first is a view of what the output looks like raw as I paste it into a Text Editor file. The second is a look after I import the text file as a CSV file [delimiter = comma, 'treat consecutive delimiters as one', and text qualifier = "] {Mac based Excel import].

Text File View of output:
name,status,description__value,description__format,weight,parent_name
African,1,,,0,
"East African",1,,,0,African;
Burund,1,,,0,"East African;"
Eritrean,1,,,1,"East African;"
Ethiopian,1,,,2,"East African;"
Kenyan,1,,,3,"East African;"
Somali,1,,,4,"East African;"
Tanzanian,1,,,5,"East African;"
Ugandan,1,,,6,"East African;"
Maasai,1,,,7,"East African;"
"North African",1,,,1,African;
Algerian,1,,,0,"North African;"
Egyptian,1,,,1,"North African;"
Libyan,1,,,2,"North African;"
Sudanese,1,,,3,"North African;"
Tunisian,1,,,4,"North African;"
"South African",1,,,2,African;
Botswana,1,,,0,"South African;"
Malagasy,1,,,1,"South African;"
Mauritian,1,,,2,"South African;"
Namibian,1,,,3,"South African;"
"South African",1,,,4,"South African;"
Zimbabwean,1,,,5,"South African;"
"West African",1,,,3,African;
Burkinabe,1,,,0,"West African;"
Ghanaian,1,,,1,"West African;"
Ivorian,1,,,2,"West African;"

CSV File View of Output:
name status description format weight parent_name
African 1 0
East African 1 0 African;
Burund 1 0 East African;
Eritrean 1 1 East African;
Ethiopian 1 2 East African;

Since this layout doesn't hold, the key thing is that the name, status, weight, and parent_name columns populate logically; the description and format columns are empty in all rows except the first header row when that checkbox option is selected.

I tried the Dev version and got the same error and result.

Here is the updated error code segment (meaning it repeats for pages). And you are correct that it is showing line number 92.

Warning: count(): Parameter must be an array or an object that implements Countable in Drupal\term_csv_export_import\Controller\ExportController->execute() (line 92 of modules/contrib/term_csv_export_import/src/Controller/ExportController.php).
Drupal\term_csv_export_import\Controller\ExportController->execute(1, 1, 0) (Line: 109)
Drupal\term_csv_export_import\Form\ExportForm->submitForm(Array, Object)
call_user_func_array(Array, Array) (Line: 114)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 52)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 593)
Drupal\Core\Form\FormBuilder->processForm('export_form', Array, Object) (Line: 321)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 91)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 573)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 708)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

It does appear to be exporting even with the error. I will try to do some more tests on other taxonomies and with reimporting some of my exports to see if they are working. I am NOT a php programmer, so I don't know if I will be much help on a patch. But I will take a look at the code and see if I piece enough together to come up with anything.

I am leaving your priority classification as you put it. My test was successful in using a copy of one of my exports to do an import with create new forum (giving it a different name). So the module is functional even though throwing the error.

Thanks for looking.

Wanted to give you an update on what might be triggering the warning. It may have to do with the size or depth of the taxonomy structure. I did four additional taxonomies around meal occasions, dietary restrictions, and a few other much smaller classification concepts; these exporting with no warning. The one that is still triggering the warnings is centered around Cuisines and is extensive because it is meant to be international in scope. Thus is has Continent, Country, Region within Country and various subclassifications beyond that. The total line count on export is right at 400 without header. So while the breadth may stay within four, it combines with substantial depth per subgroup. These may be driving the issue... but, it is these very complex taxonomies you want to have a back up for more than any other. So they are definitely worth pursuing for import/export.

Thanks for you efforts on this module.