Hi, For a while now I've been getting "(wrong-type-argument stringp nil)" errors from a timer running bibtex-parse-buffers-stealthily. Finally I've tracked it down to an "*org-src-fontification:bibtex-mode*" buffer (which is hidden, but shows up in ibuffer by pressing "C-u g"). The backtrace was not very helpful, apparently because of some defsubsts being used, but by stepping through code with edebug, I found that the problem is that the fontification buffer is in BibTeX mode, but bibtex-set-dialect has not been called, so certain variables are not initialized in that buffer, and eventually bibtex-parse-keys fails in its defsubst bibtex-type-in-head. Calling bibtex-set-dialect fixes the problem.
It seems easy enough to fix: Org should call bibtex-set-dialect in its BibTeX fontification buffer. But why has no one else has noticed this problem? It seems like this should happen to every Org user who has a BibTeX source block in an open Org buffer. Thanks.