\r
IStructuredSelection selection = (IStructuredSelection) receiver;\r
CdmBase selectedElement = (CdmBase)selection.getFirstElement();\r
- if (selectedElement.isInstanceOf(TermBase.class)){\r
+ if (selectedElement != null && selectedElement.isInstanceOf(TermBase.class)){\r
TermBase term = CdmBase.deproxy(selectedElement, TermBase.class);\r
\r
if(IS_MODIFIABLE.equals(property)){\r