BibTex import/export errors FF 4.0.1 Zotero 2.1.6

I have created an error report while exporting an item to BibTex, error report ID is: 1957326354.

Also importing from a BibTex file is not going as expected. It only creates a new collection with the BibTex's file name but none of the entries are actually imported in the collection. The error report ID is: 2112090312

"Create bibliography from selected item" works as expected though.

It seems that in both cases the error message in the FF Error Console is "win.ZoterPane.document is undefined" in chrome://zotero/content/xpcom/zotero.js at line 1395

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