Docs content sometimes empty after browsing back

[D-a-n-i-l-o]

When browsing the module docs and using the "Back" button ("<"),
the contents of the HTML view is sometimes empty.

1. Browse to std.filesystem and click on the entry "OpenCFile".
2. Click on the return type "libc.FILE Ptr" or on "String" in the parameter list.
3. The help page for "libc.FILE Ptr" or "String" is displayed.
4. Hit the back button "<" to go back to "OpenCFile"
5. The help view is now empty.

It seems to happen when jumping back from another module, but that's just a guess.
std.filesystem.OpenCFile -> jump to monkey.types.String -> can't go back to first module