diff --git a/src/caoscrawler/crawl.py b/src/caoscrawler/crawl.py
index 8b499605097ed49d5c2632fb538f43a1a9c9f415..00b69aacb6aeff690ec860d3cc610138dc8026cd 100644
--- a/src/caoscrawler/crawl.py
+++ b/src/caoscrawler/crawl.py
@@ -656,54 +656,31 @@ class Crawler(object):
 
     def add_to_remote_missing_cache(self, record: db.Record):
         """
-        adds the given identifiable to the local cache
+        stores the given Record in the remote_missing_cache.
 
-        No identifiable with the same values must exist locally.
-        (Each identifiable that is not found on the remote server, is 'cached' locally to prevent
-        that the same identifiable exists twice)
-
-        Return False if there is no identifiable for this record and True otherwise.
+        If no identifiable can be created for the given Record, the Record is NOT stored.
         """
         self.add_to_cache(record=record, cache=self.remote_missing_cache)
 
     def add_to_remote_existing_cache(self, record: db.Record):
         """
-        adds the given identifiable to the local cache
-
-        No identifiable with the same values must exist locally.
-        (Each identifiable that is not found on the remote server, is 'cached' locally to prevent
-        that the same identifiable exists twice)
+        stores the given Record in the remote_existing_cache.
 
-        Return False if there is no identifiable for this record and True otherwise.
+        If no identifiable can be created for the given Record, the Record is NOT stored.
         """
         self.add_to_cache(record=record, cache=self.remote_existing_cache)
 
-    def add_to_cache(self, record: db.Record, cache):
+    def add_to_cache(self, record: db.Record, cache) -> Union[Identifiable, None]:
         """
-        adds the given identifiable to the local cache
+        stores the given Record in the given cache.
 
-        No identifiable with the same values must exist locally.
-        (Each identifiable that is not found on the remote server, is 'cached' locally to prevent
-        that the same identifiable exists twice)
-
-        Return False if there is no identifiable for this record and True otherwise.
+        If no identifiable can be created for the given Record, the Record is NOT stored.
         """
         if self.identifiableAdapter is None:
             raise RuntimeError("Should not happen.")
         identifiable = self.identifiableAdapter.get_identifiable(record)
-        if identifiable is None:
-            # TODO: this error report is bad
-            #       we need appropriate handling for records without an identifiable
-            #       or at least a simple fallback definition if tehre is no identifiable.
-
-            # print(record)
-            # raise RuntimeError("No identifiable for record.")
-
-            # TODO: check whether that holds:
-            #       if there is no identifiable, for the cache that is the same
-            #       as if the complete entity is the identifiable:
-            return
-        cache.add(identifiable=identifiable, record=record)
+        if identifiable is not None:
+            cache.add(identifiable=identifiable, record=record)
 
     @staticmethod
     def bend_references_to_new_object(old, new, entities):