Notes Related to: No popup

Version 7.10.7
Mysql 5.7
IIS 8.5
PHP 7.2

In the Notes module when I try to modify a record. I will occasionally get the error below when I try to save but I cannot consistently reproduce the error. The record is related to an opportunity.
I also do not get any popup on the related to: If I try to mod that field.

ue Jul 10 10:31:34 2018 [3564][73099ce5-4960-cab0-ba39-4612737fcd9f][FATAL] “parent_type” is not set

Thanks in advance

Do you see anything in php_errors.log (or whatever your web server log is called) at that same time?