diff --git a/swh/provenance/journal_client.py b/swh/provenance/journal_client.py
index e410dc5..470b3dd 100644
--- a/swh/provenance/journal_client.py
+++ b/swh/provenance/journal_client.py
@@ -1,55 +1,62 @@
 # Copyright (C) 2022  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 try:
     from systemd.daemon import notify
 except ImportError:
     notify = None
 
 from swh.model.model import TimestampWithTimezone
 from swh.provenance.interface import ProvenanceInterface
 from swh.provenance.model import OriginEntry, RevisionEntry
 from swh.provenance.origin import origin_add
 from swh.provenance.revision import revision_add
 from swh.storage.interface import StorageInterface
 
 
 def process_journal_origins(
     messages, *, provenance: ProvenanceInterface, archive: StorageInterface, **cfg
 ) -> None:
     """Worker function for `JournalClient.process(worker_fn)`."""
     assert set(messages) == {"origin_visit_status"}, set(messages)
     origin_entries = [
         OriginEntry(url=visit["origin"], snapshot=visit["snapshot"])
         for visit in messages["origin_visit_status"]
         if visit["snapshot"] is not None
     ]
     if origin_entries:
         with provenance:
             origin_add(provenance, archive, origin_entries, **cfg)
     if notify:
         notify("WATCHDOG=1")
 
 
 def process_journal_revisions(
     messages, *, provenance: ProvenanceInterface, archive: StorageInterface, **cfg
 ) -> None:
     """Worker function for `JournalClient.process(worker_fn)`."""
     assert set(messages) == {"revision"}, set(messages)
-    revisions = [
-        RevisionEntry(
-            id=rev["id"],
-            date=TimestampWithTimezone.from_dict(rev["date"]).to_datetime(),
-            root=rev["directory"],
-            parents=rev["parents"],
+    revisions = []
+    for rev in messages["revision"]:
+        if rev["date"] is None:
+            continue
+        try:
+            date = TimestampWithTimezone.from_dict(rev["date"]).to_datetime()
+        except Exception:
+            continue
+
+        revisions.append(
+            RevisionEntry(
+                id=rev["id"],
+                root=rev["directory"],
+                date=date,
+                parents=rev["parents"],
+            )
         )
-        for rev in messages["revision"]
-        if rev["date"] is not None
-    ]
     if revisions:
         with provenance:
             revision_add(provenance, archive, revisions, **cfg)
     if notify:
         notify("WATCHDOG=1")