Exception when view a log due to a bug in IsArrayViewHelper

[igodorogea]

When I try to view a log in "Formhandler" backend module, I get an exception(stack below).

TYPO3: 8.7.20
Formhandler: 3.0.0

Error stack

Uncaught TYPO3 Exception
Subject given to f:count() is not countable (type: string) 

TYPO3Fluid\Fluid\Core\ViewHelper\Exception thrown in file
.../vendor/typo3fluid/fluid/src/ViewHelpers/CountViewHelper.php in line 70.

31 TYPO3Fluid\Fluid\ViewHelpers\CountViewHelper::renderStatic(array, Closure, TYPO3\CMS\Fluid\Core\Rendering\RenderingContext)

.../public/typo3temp/var/Cache/Code/fluid_template/Module_action_view_19ca6c025e5a7b2a83c84a119983166163e9c96a.php:
00411: $arguments41 = array();
00412: $arguments41['subject'] = NULL;
00413: $renderChildrenClosure42 = ($arguments41['subject'] !== null) ? function() use ($arguments41) { return $arguments41['subject']; } : $renderChildrenClosure42;$array40['0'] = TYPO3Fluid\Fluid\ViewHelpers\CountViewHelper::renderStatic($arguments41, $renderChildrenClosure42, $renderingContext);
00414: $array40['1'] = ' > 0';
00415: 

30 Module_action_view_19ca6c025e5a7b2a83c84a119983166163e9c96a::{closure}()

.../vendor/typo3fluid/fluid/src/Core/ViewHelper/AbstractConditionViewHelper.php:
00083:             }
00084:             if (isset($arguments['__thenClosure'])) {
00085:                 return $arguments['__thenClosure']();
00086:             }
00087:         } elseif (!empty($arguments['__elseClosures'])) {

29 TYPO3Fluid\Fluid\Core\ViewHelper\AbstractConditionViewHelper::renderStatic(array, Closure, TYPO3\CMS\Fluid\Core\Rendering\RenderingContext)

.../public/typo3temp/var/Cache/Code/fluid_template/Module_action_view_19ca6c025e5a7b2a83c84a119983166163e9c96a.php:
00444: };
00445: 
00446: $output33 .= Typoheads\Formhandler\ViewHelpers\IsArrayViewHelper::renderStatic($arguments35, $renderChildrenClosure36, $renderingContext);
00447: 
00448: $output33 .= '

[7elix]

Would you please rebase your code in order to see wether the issue still exists.
The corresponding code changed in the meantime to static renderStatic call.

[igodorogea]

Sorry @7elix , that was too long ago.
I don't even remember in what project I was encountering this.
Feel free to close it.