Stumped on this one - Hang when Adding Contact to Opportunity

So I create a couple of new modules which seem to work fine. However, now when I try to attach a contact to an Opportunity, it hangs I select a contact from the popup from “opportunities” and then it hangs.

It eventually adds it. There are no errors in the logs. Even if I do a debug level, there aren’t even any warnings.

I don’t know where to look next. Any suggestions?

(Oh version is 7.10.25)

So without any other ideas, I decided to upgrade PHP 7.1 to 7.3 (7.10.25 doesn’t support 7.4 yet and this is a production server so don’t want to do too many changes).

This seemed to fix the problem. Whew. Just logging if anyone else has the issue.

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