Error: Mutator 'modify()' on '@MEMBERS' cannot be called on a null value

When committing membership payments the following error occurs in batch:

Error:  Mutator 'modify()' on '@MEMBERS'  cannot be called on a null value
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

 2.91.1535, patch 71
 2.91.1535, patch 73

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