We decided to update our 3.0.10 to 3.2.7 (yes, cool features introduced there), but after update we found that Mass Update -> Template replacement dosn't work.

Error message is -

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Cannot update hosts
Details
Undefined index: inventory [ in hosts.php:385]
array_key_exists() expects parameter 2 to be array, null given [hosts.php:385 ? array_key_exists() in hosts.php:385]
Wrong fields for host "".