Component returns an empty page - Joomla! Forum - community, help and support

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hello!
i have problem joomla-based website.
one of custom components returns empty page.
the component generates table, based on mysql query results.
the problem seems dissappear if remove of columns table, (not changing query),
which makes me think wrong memory on execution_time limits. however, memory_limit has been set 256m , time limit has been set 30 sec. (parsing time limit - 60), scripts returns empty page after ~2 seconds.
how can debug thing? there way understand problem is?
i have tried error_reporting(-1), way shows me html , notice messages before stopping execution.
other pages on website seem work fine, loading taking more time.
thanks help!






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