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WebGL: INVALID_OPERATION: bindBuffer: attempt to bind a deleted buffer


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Engine.prototype.unbindInstanceAttributes = function () {
    var boundBuffer;
    for (var i = 0, ul = this._currentInstanceLocations.length; i < ul; i++) {
        var instancesBuffer = this._currentInstanceBuffers[i];
        if (boundBuffer != instancesBuffer && instancesBuffer.references) {
            boundBuffer = instancesBuffer;
        var offsetLocation = this._currentInstanceLocations[i];
        this._caps.instancedArrays.vertexAttribDivisorANGLE(offsetLocation, 0);
    this._currentInstanceBuffers.length = 0;
    this._currentInstanceLocations.length = 0;

The webglBuffer is already deleted,but when call function unbindInstanceAttributes , I add one condition  "instancesBuffer.references", is OK? @Deltakosh @RaananW

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