Python error: QColor when trying to open .pkl

Observed this error during image classification with the testdata, but I cannot really assign it to a specific action. Does not seem to disturb workflow. To be continued....
UPDATE:
Happens when trying to open a model (.pkl) file
2018-10-02T14:54:46     WARNING    Traceback (most recent call last):
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 1133, in addDataSource
              dataSourceNode = CreateNodeFromDataSource(dataSource, None)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 1457, in CreateNodeFromDataSource
              node = HubFlowObjectTreeNode(parent, dataSource)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 706, in __init__
              super(HubFlowObjectTreeNode, self).__init__(*args, **kwds)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 443, in __init__
              self.connectDataSource(dataSource)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 721, in connectDataSource
              self.fetchInternals(self.dataSource.flowObject(), parentTreeNode=self)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 775, in fetchInternals
              fetch(obj.__dict__, parentTreeNode=parentTreeNode, fetchedObjectIds=fetchedObjectIds)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 793, in fetchInternals
              fetch(value, parentTreeNode=node, fetchedObjectIds=fetchedObjectIds)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 775, in fetchInternals
              fetch(obj.__dict__, parentTreeNode=parentTreeNode, fetchedObjectIds=fetchedObjectIds)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 793, in fetchInternals
              fetch(value, parentTreeNode=node, fetchedObjectIds=fetchedObjectIds)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 808, in fetchInternals
              fetch(item, parentTreeNode=node, fetchedObjectIds=fetchedObjectIds)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 775, in fetchInternals
              fetch(obj.__dict__, parentTreeNode=parentTreeNode, fetchedObjectIds=fetchedObjectIds)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 793, in fetchInternals
              fetch(value, parentTreeNode=node, fetchedObjectIds=fetchedObjectIds)
              File "C:/Users/geo_fath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\enmapboxplugin\enmapbox\gui\datasourcemanager.py", line 771, in fetchInternals
              ci = ClassInfo(label=label, name=obj.name(label+1), color=QColor(obj.color(label+1)))
             TypeError: arguments did not match any overloaded call:
              QColor(Qt.GlobalColor): argument 1 has unexpected type 'Color'
              QColor(int): too many arguments
              QColor(QRgba64): argument 1 has unexpected type 'Color'
              QColor(Any): argument 1 has unexpected type 'Color'
              QColor(): argument 1 has unexpected type 'Color'
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