2.5.2 is also broken

[Tue Mar 05 14:39:44.289534 2019] [:error] [pid 17450] [client X.X.X.X:51310] PHP Fatal error: Class ‘Elementor\\Control_Base_Multiple’ not found in /var/www/html/X/wp-content/plugins/elementor/includes/controls/base-units.php on line 16, referer: https://X/wp-admin/admin.php?page=elementor

• This reply was modified 5 years, 9 months ago by a1exus.

Can you paste here your System Info? (WP Dashboard -> Elementor -> System Info)

BTW, Please deactivate all your plugins and change to Default WP Theme. and let me know if the problem gone.

== Server Environment ==
	Operating System: Linux
	Software: Apache/2.4.6 (Red Hat Enterprise Linux) OpenSSL/1.0.2k-fips PHP/5.4.16
	MySQL version: MariaDB Server v5.5.59-MariaDB-38.11
	PHP Version: 5.4.16
	PHP Max Input Vars: 1000
	PHP Max Post Size: 32M
	GD Installed: Yes
	ZIP Installed: Yes
	Write Permissions: All right
	Elementor Library: Connected

== WordPress Environment ==
	Version: 5.1
	Site URL: https://X.X.X
	Home URL: https://X.X.X
	WP Multisite: No
	Max Upload Size: 32 MB
	Memory limit: 40M
	Permalink Structure: /%postname%/
	Language: en-US
	Timezone: 0
	Admin Email: X
	Debug Mode: Inactive

== Theme ==
	Name: Zakra Child
	Version: 1.1.2.1551365788
	Author: ThemeGrill
	Child Theme: Yes
	Parent Theme Name: Zakra
	Parent Theme Version: 1.1.3
	Parent Theme Author: ThemeGrill

== User ==
	Role: administrator
	WP Profile lang: en_US
	User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

== Active Plugins ==
	Classic Editor
		Version: 1.4
		Author: WordPress Contributors

	Contact Form 7
		Version: 5.1.1
		Author: Takayuki Miyoshi

	Duplicate Page
		Version: 3.2
		Author: mndpsingh287

	Elementor
		Version: 2.4.7
		Author: Elementor.com

	RARA One Click Demo Import
		Version: 1.2.6
		Author: raratheme

	Theme Editor
		Version: 1.9
		Author: mndpsingh287

	ThemeGrill Demo Importer
		Version: 1.5.6
		Author: ThemeGrill

	Ultimate Responsive Image Slider
		Version: 3.3.1
		Author: WP Frank

	Wordfence Security
		Version: 7.2.3
		Author: Wordfence

== Log ==
	: <table><thead><th>JS: showing 2 of 2</th></thead><tbody class="elementor-log-entries"><tr><td>JS: 2019-02-25 23:09:30 [error X 3][https://X.X.X/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.4.7:2:167472] <strong>Cannot read property \'errors\' of undefined</strong> </td></tr><tr><td>JS: 2019-02-26 17:42:08 [error X 3][https://X.X.X/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.4.7:2:78085] <strong>Object doesn\'t support property or method \'contains\'</strong> </td></tr></tbody></table><table><thead><th>PHP: showing 3 of 3</th></thead><tbody class="elementor-log-entries"><tr><td>PHP: 2019-03-05 14:00:18 [error X 116][/var/www/html/X.X.X/wp-content/plugins/elementor/includes/controls/base-units.php::16] <strong>Class 'Elementor\Control_Base_Multiple' not found</strong> [array (
  'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]</td></tr><tr><td>PHP: 2019-03-05 17:14:10 [warning X 46][/var/www/html/X.X.X/wp-content/plugins/elementor/includes/autoloader.php::159] <strong>ucwords() expects exactly 1 parameter, 2 given</strong> [array (
  'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]</td></tr><tr><td>PHP: 2019-03-05 17:39:37 [notice X 2][/var/www/html/X.X.X/wp-content/plugins/elementor/core/logger/items/base.php::101] <strong>Array to string conversion</strong> [array (
  'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]</td></tr></tbody></table><table><thead><th>Log: showing 2 of 2</th></thead><tbody class="elementor-log-entries"><tr><td>2019-03-05 15:38:35 [info] <strong>Elementor data updater process has been completed.</strong> [array (
  'plugin' => 'Elementor',
  'from' => '2.4.7',
  'to' => '2.5.1',
)]</td></tr><tr><td>2019-03-05 17:00:25 [info] <strong>Elementor data updater process has been completed.</strong> [array (
  'plugin' => 'Elementor',
  'from' => '2.5.1',
  'to' => '2.5.2',
)]</td></tr></tbody></table>

After I downgraded plugin back to 2.4.7, site is back online…

2.5.2 is broken for me too.
I can also confirm that downgrading to 2.4.7 fixes the problem.

UPDATE
I have discovered that the problem, in my case was caused by the Black Studio TinyMCE Widget plugin. Disabling the plugin has resolved the issue for me.

Same issue here. Downgrading fixed it but this caused us some major problems.

Memory limit: 40M -> 256M it’s better!!