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Notice: Trying to get property of non-object in speakerdetailblock_preprocess_block() (line 42
This error occurs when you are getting language from a non object. To fix this check that whether the node is a object and check that 'language' exists in the $node or not.
if(is_object($node) && isset($node->language))
Then check the stuff that you are going to do.
Required, but never shown