Taxonomy: IndexOutOfBoundsException within taxonomy tree

[INFO] [talledLocalContainer] Caused by: java.lang.IndexOutOfBoundsException: Index: -1, Size: 0
[INFO] [talledLocalContainer]   at java.util.LinkedList.checkElementIndex(LinkedList.java:555) ~[?:1.8.0_181]
[INFO] [talledLocalContainer]   at java.util.LinkedList.get(LinkedList.java:476) ~[?:1.8.0_181]
[INFO] [talledLocalContainer]   at org.onehippo.taxonomy.plugin.tree.AbstractNode.getChildAt(AbstractNode.java:95) ~[hippo-plugin-taxonomy-addon-frontend-4.5.0.jar:4.5.0]
[INFO] [talledLocalContainer]   at org.apache.wicket.extensions.markup.html.tree.DefaultAbstractTree.isNodeLast(DefaultAbstractTree.java:572) ~[wicket-extensions-6.29.0.jar:6.29.0]
[INFO] [talledLocalContainer]   at org.apache.wicket.extensions.markup.html.tree.DefaultAbstractTree.access$000(DefaultAbstractTree.java:59) ~[wicket-extensions-6.29.0.jar:6.29.0]
[INFO] [talledLocalContainer]   at org.apache.wicket.extensions.markup.html.tree.DefaultAbstractTree$1.onComponentTagBody(DefaultAbstractTree.java:258) ~[wicket-extensions-6.29.0.jar:6.29.0]
[INFO] [talledLocalContainer]   at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71) ~[wicket-core-6.29.0.jar:6.29.0]
[INFO] [talledLocalContainer]   at org.apache.wicket.Component.internalRenderComponent(Component.java:2537) ~[wicket-core-6.29.0.jar:6.29.0]
[INFO] [talledLocalContainer]   ... 61 more