APEX

I am using a tabular form based on a collection that uses a fairly complicated piece of SQL to populate the collection and can take between 2-10 seconds to fetch the data. I am using a fairly standard piece to code in a process to create my collection as below.

IF APEX_COLLECTION.COLLECTION_EXISTS
(p_collection_name => 'TEAM_RESOURCE' )
THEN
APEX_COLLECTION.DELETE_COLLECTION
(p_collection_name => 'TEAM_RESOURCE' );
END IF;

APEX_COLLECTION.CREATE_COLLECTION_FROM_QUERY(
p_collection_name => 'TEAM_RESOURCE',
p_query => 'SELECT .........' );


However, if the user becomes impatient and starts pressing the button that creates the collection multiple times then I get the following error:

ORA-20104: create_collection_from_query Error:ORA-20101:Application collection exists

Can anyone provide a suggestion as to how I can avoid this error being raised?

Thanks in anticipation

Jon