[Help]Socker Error: Protocol Error

So... One day i noticed that new build, 19.5.1 came out. I made a new client for myself and started playing. Everything went fine untill i got something called protocol error... Socker server error: protocol error. I started missing white bags for this, at battle nexuses, tombs... Everywhere.
I couldnt even finish tomb, with good luck i could finish only bes and then get Protocol error when bes was killed and missed my loot.
I tried to change account and play legal at RotMG website but still i didnt get rid of my error.
When you start your client you probably get [Stream Error] in the white box.
Well, when i start my client i get something like [Project failed on false JSON input]

Sometimes, when i get protocol error, there appears a white error box that says something like [Project failed on a invalid socket]
I took a picture of red text.