[Bug]: Bar Chart: Tooltip is not shown (when data has missing category values?)

[brianzaubar]

Reproduction

Use the data from below and setup the component as explained

Describe the bug

I am getting a couple of these errors upon loading my web page with several bar charts: Cannot read properties of undefined (reading 'update') and the tooltip is not shown at all.
I am not sure if this error is triggered cause of this, but do I have to have a value for every entry category or is something like this also okay:

const groups = [
    {
        "time": "14:13:10:313 Europe/Berlin",
        "Frontend Time": 7.317
    },
    {
        "time": "14:13:12:382 Europe/Berlin",
        "Backend Time": 1.6179999999999999
    },
    {
        "time": "14:13:35:703 Europe/Berlin",
        "Backend Time": 3.559,
        "Frontend Time": 7.612
    },
    {
        "time": "14:13:36:280 Europe/Berlin",
        "Frontend Time": 2.320
    }
]

Everything else works though. I can see the legend correctly and deselect and select the categories correctly.

You can test it with the following parameters and component:
const selectedTimers = ['Backend Time', 'Frontend Time']

<BarChart
  :data="groups"
  index="time"
  :categories="selectedTimers.map(transformTimerKey)"
  :y-formatter="(tick) => {
     return `${tick} s`
  }"
  :x-formatter="(tick, i) => {
    return groups[Number(tick)] ? groups[Number(tick)].time.replace(/ [A-Za-z_]+\/[A-Za-z_]+$/, '') : ''
  }"
  :show-tooltip="true"
  :rounded-corners="4"
/>

System Info

System:
    OS: macOS 15.3.1
    CPU: (8) arm64 Apple M1 Pro
    Memory: 153.14 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.12.2 - /usr/local/bin/node
    Yarn: 1.22.22 - ~/node_modules/.bin/yarn
    npm: 10.5.0 - /usr/local/bin/npm
    bun: 1.1.4 - ~/.bun/bin/bun
  Browsers:
    Chrome: 133.0.6943.127
    Safari: 18.3

Contributes

• I am willing to submit a PR to fix this issue
• I am willing to submit a PR with failing tests