On Drupal 7.22 and PHP 5.4, the heartbeat_block_view() function trigger a strict warning.

Strict warning: Only variables should be passed by reference in heartbeat_block_view() (line 336 of /****/drupal-7.22/sites/all/modules/heartbeat/heartbeat.module).

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#1 heartbeart-7.x-1.1-issue-1993514.patch693 bytesprston

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new693 bytes

Please find the patch in attachment.