I've attached an ECM and below is my attempt at the backtrace. Let me know if I missed something.
* org-at-property-p()
* #[0 "\301 \204 \302\303!\210\304\305!\306 \210\307\310 \311#8\204 \302\312 \"\210\313 !\207" [org-columns-current-fmt-compiled org-at-property-p user-error "Not at a property" match-string-no-properties 2 org-columns-get-format-and-top-level 3 assoc-string t "No operator defined for property %s" org-columns-compute] 6 ("/home/kevin/.emacs.d/lib/org/lisp/org.elc" . 550375) nil]()
* apply(#[0 "\301 \204 \302\303!\210\304\305!\306 \210\307\310 \311#8\204 \302\312 \"\210\313 !\207" [org-columns-current-fmt-compiled org-at-property-p user-error "Not at a property" match-string-no-properties 2 org-columns-get-format-and-top-level 3 assoc-string t "No operator defined for property %s" org-columns-compute] 6 ("/home/kevin/.emacs.d/lib/org/lisp/org.elc" . 550375) nil] nil)
* org-compute-property-at-point()
funcall-interactively(org-compute-property-at-point)
call-interactively(org-compute-property-at-point)
org-property-action()
funcall-interactively(org-property-action)
call-interactively(org-property-action)
org-ctrl-c-ctrl-c(nil)
funcall-interactively(org-ctrl-c-ctrl-c nil)
call-interactively(org-ctrl-c-ctrl-c nil nil)
command-execute(org-ctrl-c-ctrl-c)