In a situation using the node.js library to make requests using the buffered transport, binary protocol and the multiplexer, I've been getting an exception on receiving responses from line 145 of connection.js (https://github.com/apache/thrift/blob/0.9.3/lib/nodejs/lib/thrift/connection.js).
at TCP.onread (net.js:531:20)
at Socket.Readable.push (_stream_readable.js:111:10)
at readableAddChunk (_stream_readable.js:153:18)
at Socket.emit (events.js:169:7)
at emitOne (events.js:77:13)
at Socket.<anonymous> (/src/node_modules/thrift/lib/nodejs/lib/thrift/buffered_transport.js:48:5)
TypeError: Cannot set property '-1' of undefined
It looks like the issue is that if a message consists of multiple parts, the first part removes the seqid to service mapping in line 142, then it's no longer available for the second part thus the error. If I'm right the fix would be to remove the mapping later on once the final part has arrived.