jquery.js conflict with Gravity Forms

When Gravity Forms Paypal Standard Add-on plugin is active and the Advanced Access Manager plugin is active, certain functions result in a syntax error:

JSON Parse error: Unrecognized token ‘<‘ jquery.js line 4

I’m no pro, but I looked at the standard WordPress jquery.js file, and line 4 is a big long beast.

When I disable either Advanced Access Manager, or the Paypal plugin, things work ok. But at the moment I can’t leave them both on.

https://ww.wp.xz.cn/plugins/advanced-access-manager/