Have you sent it to your account or to a random account at Poloniex?
If it is your own account, check your account. If it is a random account, you sent your 0.95500000 to somebody else.

https://live.blockcypher.com/btc/tx/50d44110378a552b172f2443dc92d00cfe1fd5e52f36a0d6ae2832b69757714b/
Your transaction was 3 months ago, when did you first take action?

Copying and pasting an address without checking it is a risk. Computer viruses can change the address you paste, or you can accidentally copy the wrong address.