Is it possible to stop APEX using a cached query?

I was hoping that the issue where report regions sometimes show the error: "ORA-06502: PL/SQL: numeric or value error: NULL index table key value" would be fixed in 3.1.1 however it seems not to have been (We have had it several times now). The workaround seems to be to change the query slightly such as selecting NULL as an additional column and then hiding that column.
This obviously only works AFTER the issue has occured, ie, after we have received a complaint from someone!
Is it possible to stop APEX using the cached version of some queries altogether? The ones we are calling are quite simple and so will not give that much overhead.
Thanks.

I've actually found several threads on this from the past:
ORA-06502: PL/SQL: numeric or value error: NULL index table key value
http://kr.forums.oracle.com/forums/thread.jspa?threadID=644172&tstart=120 (This thread states the problem has been fixed however it would appear either it hasn't or there is a similar bug elsewhere.)

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Ach... I found a solution thanks to previous posts which came to light after I'd posted what was obviously a question that had been asked before.

Is it possible to stop APEX using a cached query?

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