Hi
Find issue which appear only 1 time, in products list page, after any upgrade or Application folder change, but if try to refresh page all is ok and this exception disappear.
Saw this issue in local and after in 2 LIVE solutions, after upgrade to 9.13.5
Try to investigate this problem in local solution and find out that this issue starts from 9.13.4 version and still exist in 9.13.5 and 9.13.6 (in 9.13.3 all is OK)
Don't think this issue is critical, but anyway :)