Fullwidth Easy Slider Bug

I am currently running PHP 7.1.1, WordPress 4.7.3 and Enfold 4.0.5. I ran into a strange bug where I attempted to edit a Fullwidth Easy Slider on our homepage. When I clicked into any of the images, the Edit Form Element window would popup with no settings (just white) and firebug returned a 500 – Internal server error with admin-ajax.php. Deactivating all plugins did not remedy the condition. Once I did an IIS reset, it started to work again. I then added the following to wp-config.php:

define(‘WP_DEBUG’, true);
define(‘WP_DEBUG_LOG’, true);

Now in the C:\inetpub\wwwroot\\wp-content\debug.log I am seeing many instances of the following warnings:

PHP Warning: A non-numeric value encountered in C:\inetpub\wwwroot\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\html-helper.class.php on line 1054

PHP Warning: A non-numeric value encountered in C:\inetpub\wwwroot\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\html-helper.class.php on line 1056

PHP Warning: A non-numeric value encountered in C:\inetpub\wwwroot\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\html-helper.class.php on line 1063

The offending lines in html-helper.class.php are:

Line 1054: if( isset( AviaHtmlHelper::$cache[‘entry_’+$limit] ) && isset( AviaHtmlHelper::$cache[‘entry_’+$limit][$element[‘subtype’]] ) )
Line 1056: $entries = AviaHtmlHelper::$cache[‘entry_’+$limit][$element[‘subtype’]];
Line 1063: AviaHtmlHelper::$cache[‘entry_’+$limit][$element[‘subtype’]] = $entries;

I don’t know if this would have anything to do with the 500 errors, but I would like to see these warning resolved. This is what I found on those errors but don’t know enough to fix it myself:

http://stackoverflow.com/questions/42044127/warning-a-non-numeric-value-encountered

Thanks.