diff --git a/phpBB/adm/style/acp_styles.html b/phpBB/adm/style/acp_styles.html
index 81c24fe98a..3ce3b23ac1 100644
--- a/phpBB/adm/style/acp_styles.html
+++ b/phpBB/adm/style/acp_styles.html
@@ -127,7 +127,7 @@
 			<!-- IF styles_list.COMMENT != '' -->
 				<span class="error"><br />{styles_list.COMMENT}</span>
 			<!-- ENDIF -->
-			<!-- IF not styles_list.STYLE_ID and styles_list.COMMENT == '' -->
+			<!-- IF not styles_list.STYLE_ID and styles_list.COMMENT == '' and not styles_list.STYLE_INVALID -->
 				<span class="style-path"><br />{L_STYLE_PATH}{L_COLON} {styles_list.STYLE_PATH_FULL}</span>
 			<!-- ENDIF -->
 		</td>
diff --git a/phpBB/includes/acp/acp_styles.php b/phpBB/includes/acp/acp_styles.php
index 6f83b4ce51..a157d283b0 100644
--- a/phpBB/includes/acp/acp_styles.php
+++ b/phpBB/includes/acp/acp_styles.php
@@ -711,6 +711,12 @@ class acp_styles
 		// Show styles
 		foreach ($styles as &$style)
 		{
+			if (!$style['_available'] && !empty($style['_invalid']))
+			{
+				$this->list_invalid($style);
+				continue;
+			}
+
 			// Check if style has a parent style in styles list
 			$has_parent = false;
 			if ($style['_inherit_name'] != '')
@@ -795,6 +801,13 @@ class acp_styles
 			catch (\DomainException $e)
 			{
 				// Invalid composer.json
+				$style = array(
+					'_available'	=> false,
+					'_invalid'		=> true,
+					'style_path'	=> $dir,
+				);
+				$styles[] = $style;
+
 				continue;
 			}
 
@@ -1076,6 +1089,42 @@ class acp_styles
 		$this->style_counters['total']++;
 	}
 
+	/**
+	 * List invalid style
+	 *
+	 * @param array $style Array with info about style to display as invalid
+	 */
+	protected function list_invalid(&$style)
+	{
+		$style['_shown'] = true;
+
+		$row = array(
+			// Style data
+			'STYLE_INVALID'	=> true,
+			'STYLE_NAME'	=> $this->user->lang('INVALID_STYLE_MESSAGE', $style['style_path']),
+		);
+
+		$this->template->assign_block_vars('styles_list', $row);
+
+		$this->template->assign_block_vars('styles_list.actions', array(
+			'HTML'		=> $this->user->lang['CANNOT_BE_INSTALLED']
+		));
+
+		// Increase counters
+		if (!isset($this->style_counters))
+		{
+			$this->style_counters = array(
+				'total'		=> 0,
+				'active'	=> 0,
+				'inactive'	=> 0,
+				'caninstall'	=> 0,
+				'cannotinstall'	=> 0
+			);
+		}
+		$this->style_counters['cannotinstall']++;
+		$this->style_counters['total']++;
+	}
+
 	/**
 	* Show welcome message
 	*
diff --git a/phpBB/language/en/acp/styles.php b/phpBB/language/en/acp/styles.php
index 44be3c11cd..0adc95f3dc 100644
--- a/phpBB/language/en/acp/styles.php
+++ b/phpBB/language/en/acp/styles.php
@@ -54,6 +54,7 @@ $lang = array_merge($lang, [
 	'INSTALL_STYLES'							=> 'Install styles',
 	'INSTALL_STYLES_EXPLAIN'					=> 'Here you can install new styles.<br>If you cannot find a specific style in list below, check to make sure style is already installed. If it is not installed, check if it was uploaded correctly.',
 	'INVALID_STYLE_ID'							=> 'Invalid style ID.',
+	'INVALID_STYLE_MESSAGE'						=> 'The directory <strong><i>%1$s</i></strong> does not contain a valid style.',
 
 	'NO_MATCHING_STYLES_FOUND'					=> 'No styles match your query.',
 	'NO_UNINSTALLED_STYLE'						=> 'No uninstalled styles detected.',