White Page of death help needed….

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Hi, since this morning i have a issue on my wordpress installation.

it shows a fatal error message.

what i did so far:

1. deactivate all plugins
2. activated the debug log
3. looked what my servers php version is
4. checked if i can still access page and ftp space.
5. activated default twenty seventeen theme.

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all seems fine when all plugins are off, no more error message on the front page.

it just stays white. after activating the debug log,

i get the following error notes.

Fatal error:
Uncaught TypeError:
call_user_func_array(): Argument
#1 ($callback) must be a valid callback, function “ti_custom_javascript” not found or invalid function name in /mnt/web302/b3/23/53226623/htdocs/wp-includes/class-wp-hook.php:307
Stack trace:
#0 /mnt/web302/b3/23/53226623/htdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#1 /mnt/web302/b3/23/53226623/htdocs/wp-includes/plugin.php(476): WP_Hook->do_action()
#2 /mnt/web302/b3/23/53226623/htdocs/wp-includes/general-template.php(3042): do_action()
#3 /mnt/web302/b3/23/53226623/htdocs/wp-content/themes/twentyseventeen/header.php(22): wp_head()
#4 /mnt/web302/b3/23/53226623/htdocs/wp-includes/template.php(770): require_once(‘…’)
#5 /mnt/web302/b3/23/53226623/htdocs/wp-includes/template.php(716): load_template()
#6 /mnt/web302/b3/23/53226623/htdocs/wp-includes/general-template.php(48): locate_template()
#7 /mnt/web302/b3/23/53226623/htdocs/wp-content/themes/twentyseventeen/front-page.php(15): get_header()
#8 /mnt/web302/b3/23/53226623/htdocs/wp-includes/template-loader.php(106): include(‘…’)
#9 /mnt/web302/b3/23/53226623/htdocs/wp-blog-header.php(19): require_once(‘…’)
#10 /mnt/web302/b3/23/53226623/htdocs/index.php(17): require(‘…’)
#11 {main} thrown in /mnt/web302/b3/23/53226623/htdocs/wp-includes/class-wp-hook.php on line 307

cant make muchsense of it. it seems to me that a custom ti script tries to get loaded.

but i cant make out where or why that would be.

yould some one point me into a direction?

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