ConcurrentModificationException on ActiveModel#destroy

Hello everyone,

When calling ActiveModel#destroy via your API for some reason this is happening:

java.util.ConcurrentModificationException: null
        at java.util.HashMap.forEach(HashMap.java:1424) ~[?:?]
        at com.ticxo.modelengine.v1_20_R1.parser.model.DisplayParser.remove(DisplayParser.java:228) ~[ModelEngine-4.0.5.jar:?]
        at com.ticxo.modelengine.v1_20_R1.parser.model.DisplayParser.destroy(DisplayParser.java:72) ~[ModelEngine-4.0.5.jar:?]
        at com.ticxo.modelengine.v1_20_R1.parser.model.DisplayParser.destroy(DisplayParser.java:25) ~[ModelEngine-4.0.5.jar:?]
        at com.ticxo.modelengine.core.model.render.DisplayRendererImpl.destroy(DisplayRendererImpl.java:193) ~[ModelEngine-4.0.5.jar:?]
        at com.ticxo.modelengine.core.model.ActiveModelImpl.destroy(ActiveModelImpl.java:135) ~[ModelEngine-4.0.5.jar:?]

Is there something I'm doing wrong? Thanks in advance