diff --git a/src/caoscrawler/crawl.py b/src/caoscrawler/crawl.py
index d88f8b939eb6fdac4b3aadeee3297816198a19bc..23e39cbb31545cb69cffdf3cae26c07d67763dea 100644
--- a/src/caoscrawler/crawl.py
+++ b/src/caoscrawler/crawl.py
@@ -385,7 +385,7 @@ class Crawler(object):
                         if st.raise_problems:
                             raise
                         else:
-                            remove, rmrefs = st.remove_failed(se)
+                            remove = st.remove_failed(se)
                             entity_was_treated = True
                             continue
 
@@ -413,6 +413,9 @@ class Crawler(object):
                         se.identifiable))
                 remote_id = None
                 if identified_record is not None:
+                    if se.registered_identifiable.get_property("name") is None:
+                        print("FOUND")
+                        print(se)
                     remote_id = identified_record.id
                 st.set_id_of_node(se, remote_id)
                 entity_was_treated = True
diff --git a/src/caoscrawler/identifiable_adapters.py b/src/caoscrawler/identifiable_adapters.py
index 7d20b784add4edaa41516e8c5654fd679e339137..13ff9b1c516a40b43419148766982f862f15f503 100644
--- a/src/caoscrawler/identifiable_adapters.py
+++ b/src/caoscrawler/identifiable_adapters.py
@@ -390,6 +390,8 @@ startswith: bool, optional
     def referencing_entity_has_appropriate_type(parents, register_identifiable):
         if register_identifiable.get_property("is_referenced_by") is None:
             return False
+        if register_identifiable.get_property("is_referenced_by").value is None:
+            return False
         appropriate_types = [el.lower() for el in
                              register_identifiable.get_property("is_referenced_by").value]
         if "*" in appropriate_types:
diff --git a/src/caoscrawler/sync_graph.py b/src/caoscrawler/sync_graph.py
index 0bd038abe6884fe93215bfec6fb12b25882e03ad..468fab51a774944f06b94fb82c9f5e29ccf02132 100644
--- a/src/caoscrawler/sync_graph.py
+++ b/src/caoscrawler/sync_graph.py
@@ -141,7 +141,7 @@ class SyncGraph():
                 else:
                     remove = self.remove_failed(node)
                     logger.error(exc)
-                    logger.error(f"{len(remove)}, {len(rmrefs)}")
+                    logger.error(f"{len(remove)}")
         for node in list(self.nodes):
             try:
                 identifiable = self.identifiableAdapter.get_identifiable(
@@ -201,6 +201,7 @@ class SyncGraph():
                 for referencing in self.backward_references[node.uuid]:
                     if referencing.id > 0:
                         # check whether the node can be associated with an existing one
+                        logger.error(str(referencing))
                         raise NotImplementedError('update of existing non ident')
                         break
                 # if we reach this, there is no existing entity, thus we can just insert node
@@ -210,14 +211,6 @@ class SyncGraph():
         entities = []
         node_map = {}
         self.deal_with_non_ident()
-        for k, el in self.forward_references.items():
-            print(k, "references")
-            for e in el:
-                print(e.uuid)
-        print('UNCHECKED ENTITIES')
-        for el in self.unchecked:
-            print(el.uuid)
-            print(el)
         for el in self.nodes:
             try:
                 el.export_entity()
@@ -227,7 +220,7 @@ class SyncGraph():
                 else:
                     remove = self.remove_failed(el)
                     logger.error(exc)
-                    logger.error(f"{len(remove)}, {len(rmrefs)}")
+                    logger.error(f"{len(remove)}")
         for el in self.nodes:
             try:
                 entities.append(el.export_entity())
@@ -238,7 +231,7 @@ class SyncGraph():
                 else:
                     remove = self.remove_failed(el)
                     logger.error(exc)
-                    logger.error(f"{len(remove)}, {len(rmrefs)}")
+                    logger.error(f"{len(remove)}")
 
         if len(self.unchecked) > 1:
             self.unchecked_contains_circular_dependency()
@@ -287,7 +280,7 @@ class SyncGraph():
                 if referenced in self.unchecked:
                     if referenced in circle:
                         closed = True
-                    circle.append(pval)  # FIXME
+                    circle.append(referenced)
                     added_to_circle = True
             if not added_to_circle:
                 return None
@@ -403,7 +396,7 @@ class SyncGraph():
             self.forward_id_referenced_by[other.uuid].remove(node)
 
         for el in remove:
-            rm, rf = self.remove_failed(el)
+            rm = self.remove_failed(el)
             remove.extend(rm)
         return remove
 
diff --git a/tox.ini b/tox.ini
index e587774323171dda590c4e9198e049c1ed0e0e14..1b308b34ef15da4cfed8410eb75ca8669aa3bc20 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,4 +18,5 @@ max-line-length = 100
 
 [pytest]
 testpaths = unittests
-xfail_strict = True
\ No newline at end of file
+xfail_strict = True
+pdbcls = IPython.terminal.debugger:Pdb