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I get following php warnings when using entityfieldquery.
Warning: array_merge(): Argument #2 is not an array in mongodb_field_storage_query() (line 367 of /siteroot/sites/all/modules/contrib/mongodb/mongodb_field_storage/mongodb_field_storage.module).
EntityFieldQuery in question has entity, property and fieldconditions and fieldorderby statements. Since php 5.0 array_merge has accepted arrays only.