When a ferry is needed but not allowed, the planner crashes

If you plan a route from Groningen (NL) to Den Burg on the island of Texel (NL), you need a ferry. If you set ‘avoid on route: ferries and car trains’ the application crashes (on the web as well as on mobile phone) showing the pop up.

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The error does not appear if you enable the ferry option again. Previously it did not crash but gave a message like ‘route not possible’.