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New wordpress site running on PHP 7.2 and Chronoforms 5. Cannot create or save forms, getting a ton of PHP errors in the logs:
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[13-Mar-2019 18:08:17 UTC] PHP Warning: Illegal string offset 'js_8' in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Cannot assign an empty string to a string offset in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Illegal string offset 'css_7' in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Cannot assign an empty string to a string offset in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Illegal string offset 'load_captcha_6' in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Cannot assign an empty string to a string offset in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Illegal string offset 'html_5' in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Cannot assign an empty string to a string offset in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Illegal string offset 'check_captcha_2' in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Cannot assign an empty string to a string offset in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Warning: Illegal string offset 'check_captcha_2' in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1
[13-Mar-2019 18:08:17 UTC] PHP Fatal error: Uncaught Error: Cannot use string offset as an array in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code:1
Stack trace:
#0 /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60): eval()
#1 /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/admin/chronoforms/chronoforms.php(184): GCore\Libs\Arr::setVal(Array, Array, '')
#2 /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/app_wp.php(246): GCore\Admin\Extensions\Chronoforms\Chronoforms->save()
#3 /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/app_wp.php(437): GCore\Libs\AppWp->dispatch(true)
#4 /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/wordpress_gcloader.php(85): GCore\Libs\AppWp::call('admin', 'chronoforms', '', 'save', Array)
#5 /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/chronoforms5.php(86): WordpressGCLoader->__construct('admin', 'chronoforms', 'chronoforms')
#6 /home/gsi in /xxx/xxx/xxx/xxx/wp-content/plugins/chronoforms/cegcore/libs/arr.php(60) : eval()'d code on line 1

Any thoughts on this?

Reinstall CF maybe or just move to v6

Hi tschoch,
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This thread may help - though I understood this had been fixed in the current releases.
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Bob