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Make sure that all session contexts has unique IDs even if they don't have a kernel #3971

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Make sure that all session contexts has unique IDs even if they don't have a kernel #3971

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12 changes: 11 additions & 1 deletion python/jupyterlab_widgets/src/plugin.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -138,6 +138,8 @@ function* chain<T>(
}
}

const NO_KERNEL_SESSION_CONTEXT_IDS = new WeakMap<ISessionContext, string>();

/**
* Get the kernel id of current notebook or console panel, this value
* is used as key for `Private.widgetManagerProperty` to store the widget
Expand All @@ -150,7 +152,15 @@ async function getWidgetManagerOwner(
sessionContext: ISessionContext
): Promise<Private.IWidgetManagerOwner> {
await sessionContext.ready;
return sessionContext.session!.kernel!.id;
let id = sessionContext.session?.kernel?.id;
if (id === undefined) {
id = NO_KERNEL_SESSION_CONTEXT_IDS.get(sessionContext);
if (id === undefined) {
id = 'no-kernel-' + base.uuid();
NO_KERNEL_SESSION_CONTEXT_IDS.set(sessionContext, id);
}
}
return id;
}

/**
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