Unity6000.0.4f1c1 webgl build send bytes error

[nansnunen]

004.framework.js.br:9 Uncaught ReferenceError: buffer is not defined at _WebSocketSend (004.framework.js.br:9:144574) at 004.wasm.br:0x38622a9 at invoke_iiii (004.framework.js.br:9:419715) at 004.wasm.br:0x2b6843a at 004.wasm.br:0x38622f0 at invoke_iiiii (004.framework.js.br:9:420026) at 004.wasm.br:0x2b682ac at 004.wasm.br:0x38622fe at invoke_viii (004.framework.js.br:9:419865) at 004.wasm.br:0x2b6e732 at 004.wasm.br:0x2db9037 at 004.wasm.br:0x2ddd195 at 004.wasm.br:0x38622a9 at invoke_iiii (004.framework.js.br:9:419715) at 004.wasm.br:0x2ddc840 at 004.wasm.br:0xe2d02 at 004.wasm.br:0x382d945 at 004.wasm.br:0x37c5e2b at 004.wasm.br:0x3123ab0 at 004.wasm.br:0x375bf4e at 004.wasm.br:0x311edfd at 004.wasm.br:0x311f115 at 004.wasm.br:0x311e193 at 004.wasm.br:0x311c93f at 004.wasm.br:0x35fc9d4 at 004.wasm.br:0x35fca49 at 004.wasm.br:0x3836603 at 004.wasm.br:0x3862306 at 004.framework.js.br:9:19798 at _JS_CallAsLongAsNoExceptionsSeen (004.framework.js.br:9:19812) at 004.wasm.br:0x3830af2 at 004.wasm.br:0x3862306 at browserIterationFunc (004.framework.js.br:9:111568) at callUserCallback (004.framework.js.br:9:93930) at Object.runIter (004.framework.js.br:9:95297) at Browser_mainLoop_runner (004.framework.js.br:9:111094)