Plenty of PHP Notice, Warnings, Fatal errors

Hi there,
Thanks for a great template!
Unfortunately I have many errors/notice/warnings reported in debug.log. As long these are only Notice/Warnings no problem but fatal errors has happens too. At the moment my webiste is online but not accessible to customers yet, no traffic at all.. At the moment I`m working only in back-end, adding some products. Website has collapse already twice. Once I had to re-write woocommerce files to make it work again.
I am simply afraid when the website will be published I will get much more of these fatal errors and site-downs. I found that majority of this Notice/Warnings/Fatal errors happens while working on the back end. I already spoke to my hosting provider, memory limit is increased to 256MB. I tried to switch off all unnecassary plugins but at the end fatal errors are still reported. Could you guys please have a look on it and perhaps provide me an solution? Thank you in advance

All the plugins not required by template are switched off.
In attach you may find debug.log file, in private content section I provide you wp and ftp logins.

Below some bugs codes:
[21-Nov-2019 13:35:37 UTC] PHP Notice: A non well formed numeric value encountered in /wp-content/themes/woodmart/inc/shortcodes/responsive-text-block.php on line 71
[21-Nov-2019 13:37:36 UTC] PHP Notice: Undefined index: exclude_replies in /wp-content/themes/woodmart/inc/template-tags.php on line 1608
[21-Nov-2019 23:57:08 UTC] PHP Notice: Undefined index: nmihover in /wp-content/themes/woodmart/inc/modules/nav-menu-images/inc/admin.php on line 269
[21-Nov-2019 23:57:08 UTC] PHP Notice: Undefined index: post_parent in /wp-content/themes/woodmart/inc/modules/nav-menu-images/inc/admin.php on line 272
[21-Nov-2019 23:57:08 UTC] PHP Notice: Undefined index: nmiactive in /wp-content/themes/woodmart/inc/modules/nav-menu-images/inc/admin.php on line 275
[21-Nov-2019 23:57:08 UTC] PHP Notice: Undefined index: post_parent in /wp-content/themes/woodmart/inc/modules/nav-menu-images/inc/admin.php on line 278
[22-Nov-2019 21:51:39 UTC] PHP Notice: Undefined index: white in /wp-content/themes/woodmart/inc/integrations/visual-composer/fields/dropdown.php on line 11
[22-Nov-2019 21:51:39 UTC] PHP Notice: Undefined index: white in /wp-content/themes/woodmart/inc/integrations/visual-composer/fields/dropdown.php on line 13
[22-Nov-2019 21:51:39 UTC] PHP Notice: Undefined index: gradient in /wp-content/themes/woodmart/inc/integrations/visual-composer/fields/dropdown.php on line 11
[22-Nov-2019 21:51:39 UTC] PHP Notice: Undefined index: gradient in /wp-content/themes/woodmart/inc/integrations/visual-composer/fields/dropdown.php on line 13
[22-Nov-2019 21:53:22 UTC] PHP Warning: substr() expects parameter 1 to be string, array given in /wp-content/plugins/woocommerce/includes/wc-formatting-functions.php on line 871
[22-Nov-2019 21:53:22 UTC] PHP Warning: substr() expects parameter 1 to be string, array given in /wp-content/plugins/woocommerce/includes/wc-formatting-functions.php on line 872
[22-Nov-2019 21:53:22 UTC] PHP Warning: substr() expects parameter 1 to be string, array given in /wp-content/plugins/woocommerce/includes/wc-formatting-functions.php on line 873
[22-Nov-2019 21:53:22 UTC] PHP Notice: Array to string conversion in /wp-content/themes/woodmart/inc/integrations/visual-composer/fields/dropdown.php on line 13
[25-Nov-2019 15:54:39 UTC] PHP Fatal error: Out of memory (allocated 16777216) (tried to allocate 2105344 bytes) in /autoinstalator/wordpress/wp-content/plugins/js_composer/include/templates/editors/partials/backend-shortcodes-templates.tpl.php on line 36

Hello,

We have fixed a part of these errors in our last update. As for the Fatal error, it seems to be an issue with your PHP memory limit on the server. You need to contact your hosting provider to resolve this problem.

Kind Regards

[Author]

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