Error: Invalid character in a Base-64 string Recurring Gifts

Event log or the plugin show the error:

Invalid character in a Base-64 string

When working with Recurring Gifts.

Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.9.1001, 27
 6.45.2034.14

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