diff --git a/external/base.py b/external/base.py
index 058985b..498ce8f 100644
--- a/external/base.py
+++ b/external/base.py
@@ -258,7 +258,7 @@ class Extractor(Base):
         return self.getConceptElement(name, obj)
 
     def getAssignmentElement(self, obj, child, predicate):
-        if IResource.providedBy(obj):
+        if IResource.providedBy(child):
             for r in obj.getResourceRelations([predicate], child):
                 return self.getResourceRelationElement(r)
         else: