[horde] Fatal error has occurred count(): Argument #1 ($value) must be of type Countable

[Simon B]

Hi Ralf, et al..

with increasing frequency, I am getting this error:

A fatal error has occurred
count(): Argument #1 ($value) must be of type Countable|array, bool given
in
/usr/share/2024-composer-horde6/vendor/horde/text_filter/lib/Horde/Text/Filter/Dimsignature.php:30

 1. IMP_Dynamic_Base->__construct()
/usr/share/2024-composer-horde6/vendor/horde/imp/dynamic.php:32
 2. IMP_Dynamic_Message->_init()
/usr/share/2024-composer-horde6/vendor/horde/imp/lib/Dynamic/Base.php:87
 3. IMP_Contents_Message->showMessage()
/usr/share/2024-composer-horde6/vendor/horde/imp/lib/Dynamic/Message.php:66
 4. IMP_Contents_Message->getInlineOutput()
/usr/share/2024-composer-horde6/vendor/horde/imp/lib/Contents/Message.php:175
 5. IMP_Contents_Message->_getInlineOutput()
/usr/share/2024-composer-horde6/vendor/horde/imp/lib/Contents/Message.php:335
 6. IMP_Contents->renderMIMEPart()
/usr/share/2024-composer-horde6/vendor/horde/imp/lib/Contents/Message.php:594
 7. Horde_Mime_Viewer_Base->render()
/usr/share/2024-composer-horde6/vendor/horde/imp/lib/Contents.php:660
 8. IMP_Mime_Viewer_Plain->_renderInline()
/usr/share/2024-composer-horde6/vendor/horde/mime_viewer/lib/Horde/Mime/Viewer/Base.php:156
 9. IMP_Mime_Viewer_Plain->_impRender()
/usr/share/2024-composer-horde6/vendor/horde/imp/lib/Mime/Viewer/Plain.php:49
10. Horde_Mime_Viewer_Base->_textFilter()
/usr/share/2024-composer-horde6/vendor/horde/imp/lib/Mime/Viewer/Plain.php:159
11. Horde_Core_Factory_TextFilter->filter()
/usr/share/2024-composer-horde6/vendor/horde/mime_viewer/lib/Horde/Mime/Viewer/Base.php:438
12. Horde_Text_Filter::filter()
/usr/share/2024-composer-horde6/vendor/horde/core/lib/Horde/Core/Factory/TextFilter.php:70
13. Horde_Text_Filter_Dimsignature->postProcess()
/usr/share/2024-composer-horde6/vendor/horde/text_filter/lib/Horde/Text/Filter.php:108

Although I have not actually updated any code in this file path for more
than one year..

(and I am a little reluctant to upgrade/refresh since I do not have the
time for trouble-shooting at the moment.)

Is there a simple fix?

Regards

Simon