How is the message being reported: Through a JavaScript alert dialog, or the JS console, or where?

Usually such things can be debugged by putting breakpoints into the code (e.g. using Chrome dev tools), thus my question above.

The class tree does not require labels AFAIK.

Holger


On 30/07/2018 15:42, Rob Atkinson wrote:
(unmodified) SWA editor throws a message "null" when opening Class tree at a specific class

data has no instances (also throws if instances) - it imports an ontology loaded via EDG (which a specialisation of PROV-O).

If you ignore this, the class tree works - and if you reopen that class it does not throw the error again - only after reloading the editor page, the first time.

So three questions:
1) what is causing this (if known or guessable)
2) is there any way to get more useful diagnostics - such as a stack trace or something  to show where it fails 3) is there a unknown contract - i.e. something the data _must_ do - such as have labels (in this case all classes do) - or should it really handle any OWL class model ?



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