intermittent "Moped::Protocol::Command failed with error nil" errors in Resque workers

I'm using Rails 3.2, Mongoid 3.1.7, Moped 1.5.3, and Resque 1.24.1

I'm repeatedly getting "Moped::Protocol::Command failed with error nil" [1] errors in my Resque workers.

This issue, and this one in the Moped repo make me think this is probably due to Resque forking, but they're both about older versions of Moped than I'm using, and I've been unable to find any specific information specific to configuring Resque to work nicely with Mongoid.

How do I resolve the errors in my Resque workers?

[1] Full error: Exception: Moped::Errors::OperationFailure Error: The operation: #<Moped::Protocol::Command @length=58 @request_id=3 @response_to=0 @op_code=2004 @flags=[] @full_collection_name="admin.$cmd" @skip=0 @limit=-1 @selector={:ismaster=>1} @fields=nil> failed with error nil /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:99:in `block in command' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:600:in `[]' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:600:in `block (3 levels) in flush' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:599:in `map' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:599:in `block (2 levels) in flush' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:150:in `ensure_connected' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:595:in `block in flush' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:610:in `logging' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:594:in `flush' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:583:in `process' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:92:in `command' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/node.rb:409:in `refresh' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/cluster.rb:171:in `block in refresh' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/cluster.rb:185:in `each' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/cluster.rb:185:in `refresh' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/cluster.rb:135:in `nodes' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/cluster.rb:206:in `with_primary' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/session/context.rb:108:in `with_node' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/cursor.rb:137:in `load_docs' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/cursor.rb:25:in `each' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/query.rb:76:in `each' /shared/bundle/ruby/2.2.0/gems/moped-1.5.3/lib/moped/query.rb:76:in `each' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/contextual/mongo.rb:423:in `entries' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/contextual/mongo.rb:423:in `check_existence' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/contextual/mongo.rb:146:in `exists?' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/contextual.rb:19:in `exists?' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/validations/uniqueness.rb:273:in `validate_root' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/validations/uniqueness.rb:52:in `block in validate_each' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/validations/queryable.rb:23:in `with_query' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/validations/uniqueness.rb:46:in `validate_each' /shared/bundle/ruby/2.2.0/gems/activemodel-3.2.22/lib/active_model/validator.rb:153:in `block in validate' /shared/bundle/ruby/2.2.0/gems/activemodel-3.2.22/lib/active_model/validator.rb:150:in `each' /shared/bundle/ruby/2.2.0/gems/activemodel-3.2.22/lib/active_model/validator.rb:150:in `validate' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:310:in `_callback_before_265' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:418:in `_run__123721054543109017__validate__3207805434451540367__callbacks' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:405:in `__run_callback' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:385:in `_run_validate_callbacks' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:81:in `run_callbacks' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/callbacks.rb:130:in `run_callbacks' /shared/bundle/ruby/2.2.0/gems/activemodel-3.2.22/lib/active_model/validations.rb:228:in `run_validations!' /shared/bundle/ruby/2.2.0/gems/activemodel-3.2.22/lib/active_model/validations/callbacks.rb:53:in `block in run_validations!' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:403:in `_run__123721054543109017__validation__3207805434451540367__callbacks' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:405:in `__run_callback' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:385:in `_run_validation_callbacks' /shared/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/callbacks.rb:81:in `run_callbacks' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/callbacks.rb:130:in `run_callbacks' /shared/bundle/ruby/2.2.0/gems/activemodel-3.2.22/lib/active_model/validations/callbacks.rb:53:in `run_validations!' /shared/bundle/ruby/2.2.0/gems/activemodel-3.2.22/lib/active_model/validations.rb:195:in `valid?' /shared/bundle/ruby/2.2.0/gems/mongoid-3.1.7/lib/mongoid/validations.rb:84:in `valid?' /releases/20160315172839/app/performers/garmin_receive_push.rb:11:in `block in perform' /releases/20160315172839/app/performers/garmin_receive_push.rb:9:in `map' /releases/20160315172839/app/performers/garmin_receive_push.rb:9:in `perform'