[Bug] HeatmapLayer example hangs

[zxweed]

Description

Example code at https://deckgl.readthedocs.io/en/latest/gallery/heatmap_layer.html hangs when zooming or panning.

The same is observed when running the example code in JupyterLab

Flavors

• Script tag
• React
• Python/Jupyter notebook
• MapboxOverlay
• GoogleMapsOverlay
• CartoLayer
• ArcGIS

Expected Behavior

No response

Steps to Reproduce

Just open the example page and zoom/pan

Environment

• Framework version: 0.9.1
• Browser: Chrome and Safari
• OS: MacOS

Logs

No response

[duber-oai]

Issue needs a pydeck label.

From the console, it looks like a problem with the tooltip that is causing the application to freeze.

Uncaught TypeError: Cannot read properties of null (reading 'map')
    at Nz (widget-tooltip.js:126:53)
    at widget-tooltip.js:177:33
    at $x.onHover (tooltip.js:45:29)
    at ME.onHover (widget-manager.js:195:24)
    at sg._pickAndCallback (deck.js:583:36)
    at sg._onRenderFrame (deck.js:717:14)
    at Nx._renderFrame (animation-loop.js:256:20)
    at Nx.redraw (animation-loop.js:154:14)
    at Nx._animationFrame (animation-loop.js:244:14)