Error updating your document: "null to null"

I am using Zotero add-on w/ google docs to write my manuscript. Citations were working well initially but now when I try to add a citation it get the following error:

TypeError: Cannot set property "insert" of null to "null"
at Code 9Zotero Google Docs Integration): 381
at Code 9Zotero Google Docs Integration): 72 (callMethod)

Any advice would be greatly appreciated!
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