error #1476107295: PHP Warning: htmlspecialchars() expects parameter 1 to be string, array given

[blueamerican]

error with preview checkbox clicked in Extension manager.

When opening a page with a CE from mask_export (contains only one image element), i get the following error:
#1476107295: PHP Warning: htmlspecialchars() expects parameter 1 to be string, array given

see also screen
TYPO3 8.7.4
mask_export 0.9.1

[blueamerican]

the reason is the code in the generated backend template

[IchHabRecht]

Hi Markus,

Thank you for your report. I found the problem within the TYPO3 CMS and fixed the template generation. Would you mind to test the pull request #92

Thank you very much.