Error Showing After Set Php 7.0.11

hello cs cart experts

we are using cs cart 4.3.6

we are using php 7.0.11 from last two moths but there is not issue

but just yesterday we are getting this error :

Warning: next() expects parameter 1 to be array, null given in /home/our_website_name/public_html/app/Tygh/Bootstrap.php on line 420

& when we switch back to php 5 than its working good but not working with php 7 what is the issue ??

please help us with file name & code to modify

Thanks in advance

Thanks for replay now i solved it :D