diff --git a/CHANGES.rst b/CHANGES.rst
index 59e04629..092c9876 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,8 @@ Changelog
 1.4.45 (unreleased)
 -------------------
 
-- Nothing changed yet.
+- WEB-4414: Fix ProcedureViewlet crashing when procedure_ts token is no longer in vocabulary
+  [remdub]
 
 
 1.4.44 (2026-04-28)
diff --git a/src/imio/smartweb/core/tests/test_procedure.py b/src/imio/smartweb/core/tests/test_procedure.py
index fae933e6..868a1cc8 100644
--- a/src/imio/smartweb/core/tests/test_procedure.py
+++ b/src/imio/smartweb/core/tests/test_procedure.py
@@ -224,6 +224,14 @@ def test_get_selected_procedure_title_returns_term_when_set(self, m):
         self.assertIsNotNone(term)
         self.assertIn("Acte de d\\u00e9c\\u00e8s", term.title)
 
+    @requests_mock.Mocker()
+    def test_get_selected_procedure_title_none_when_unknown_token(self, m):
+        url = f"{WCS_URL}formdefs/"
+        m.get(url, text=json.dumps(self.json_procedures_raw_mock))
+        self.procedure.procedure_ts = "https://nonexistent-procedure.be/unknown/"
+        viewlet = self._make_viewlet()
+        self.assertIsNone(viewlet.get_selected_procedure_title())
+
     # --- is_anonymous ---
 
     def test_is_anonymous_returns_false_when_authenticated(self):
diff --git a/src/imio/smartweb/core/viewlets/procedure.py b/src/imio/smartweb/core/viewlets/procedure.py
index e3ec29f1..3d0386fe 100644
--- a/src/imio/smartweb/core/viewlets/procedure.py
+++ b/src/imio/smartweb/core/viewlets/procedure.py
@@ -13,7 +13,10 @@ def get_selected_procedure_title(self):
             IVocabularyFactory, "imio.smartweb.vocabulary.PublikProcedures"
         )
         vocabulary = factory()
-        term = vocabulary.getTerm(self.context.procedure_ts)
+        try:
+            term = vocabulary.getTerm(self.context.procedure_ts)
+        except LookupError:
+            return None
         return term
 
     @property