Fatal error – Envira Gallery Lite v 1.8.4.0 – shortcode.php

WP 5.9.2, Envira Gallery Lite v. 1.8.4, PHP 8.0.16

After updating to Envira Gallery Lite v. 1.8.4 I get the following fatal error:

<b>Fatal error</b>:  Uncaught Error: Call to undefined function is_plugin_active() in 
  /var/.../plugins/envira-gallery-lite/includes/global/shortcode.php:1955
Stack trace:
#0 /var/.../plugins/envira-gallery-lite/includes/global/shortcode.php(198): Envira_Gallery_Shortcode->plugin_humility()
#1 /var/.../wp-includes/shortcodes.php(356): Envira_Gallery_Shortcode->shortcode(Array, '', 'envira-gallery')
#2 [internal function]: do_shortcode_tag(Array)
#3 /var/.../wp-includes/shortcodes.php(228): preg_replace_callback('/\\[(\\[?)(envira...', 'do_shortcode_ta...', '\n<h1 class=&quot;sei...')
#4 /var/.../wp-includes/class-wp-hook.php(307): do_shortcode('\n<h1 class=&quot;sei...')
#5 /var/.../wp-includes/plugin.php(189): WP_Hook->apply_filters('\n<h1 class=&quot;sei...', Array)
#6 /var/.../wp-includes/post-template.php(253): apply_filters('the_content', '<!-- wp:heading...')
#7 /var/.../themes/inspiro-child/template-parts/page/content-page.php(56): the_content()
#8 /var/.../wp-includes/template.php(772): require('/var/vhosts...')
#9 /var/.../wp-includes/template.php(716): load_template('/var/vhosts...', false, Array)
#10 /var/.../wp-includes/general-template.php(204): locate_template(Array, true, false, Array)
#11 /var/.../themes/inspiro-child/page.php(33): get_template_part('template-parts/...', 'page')
#12 /var/.../wp-includes/template-loader.php(106): include('/var/vhosts...')
#13 /var/.../wp-blog-header.php(19): require_once('/var/vhosts...')
#14 /var/.../index.php(17): require('/var/vhosts...')
#15 {main}
  thrown in <b>/var/.../plugins/envira-gallery-lite/includes/global/shortcode.php</b> on line <b>1955</b><br />

Removing

if ( is_plugin_active( 'enable-media-replace/enable-media-replace.php' ) ) {
            add_action( 'enable-media-replace-upload-done', array( $this, 'emr_clear_envira_cache' ), 10, 3 );
}

helps as a temporary solutuion.

Thanx for a corrected update!