error throw when tooltip.show=false is set

[netil]

Description

When tooltip.show=false is set, hovering chart area will throw error.
Seems side effect caused from #3292

Steps to check or reproduce

bb.generate({
  data: {
    columns: [
      ["data1", 30, 200, 100, 400, 150, 250],
      ["data2", 130, 100, 140, 200, 150, 50]
    ],
    type: "bar", // for ESM specify as: bar()
  },
  bar: {
    width: {
      ratio: 0.5
    }
  },
  tooltip: {
    show: false,
  },
});