diff --git a/src/documents/tests/test_workflows.py b/src/documents/tests/test_workflows.py
index af3849ae9..6ca238377 100644
--- a/src/documents/tests/test_workflows.py
+++ b/src/documents/tests/test_workflows.py
@@ -48,6 +48,7 @@ from documents.models import WorkflowActionEmail
 from documents.models import WorkflowActionWebhook
 from documents.models import WorkflowRun
 from documents.models import WorkflowTrigger
+from documents.serialisers import WorkflowTriggerSerializer
 from documents.signals import document_consumption_finished
 from documents.tests.utils import DirectoriesMixin
 from documents.tests.utils import DummyProgressManager
@@ -1377,6 +1378,103 @@ class TestWorkflows(
         self.assertIn(doc1, filtered)
         self.assertNotIn(doc2, filtered)
 
+    def test_consumption_trigger_requires_filter_configuration(self):
+        serializer = WorkflowTriggerSerializer(
+            data={
+                "type": WorkflowTrigger.WorkflowTriggerType.CONSUMPTION,
+            },
+        )
+
+        self.assertFalse(serializer.is_valid())
+        errors = serializer.errors.get("non_field_errors", [])
+        self.assertIn(
+            "File name, path or mail rule filter are required",
+            [str(error) for error in errors],
+        )
+
+    def test_existing_document_invalid_custom_field_query_configuration(self):
+        trigger = WorkflowTrigger.objects.create(
+            type=WorkflowTrigger.WorkflowTriggerType.DOCUMENT_ADDED,
+            filter_custom_field_query="{ not json",
+        )
+
+        document = Document.objects.create(
+            title="doc invalid query",
+            original_filename="invalid.pdf",
+            checksum="checksum-invalid-query",
+        )
+
+        matched, reason = existing_document_matches_workflow(document, trigger)
+        self.assertFalse(matched)
+        self.assertEqual(reason, "Invalid custom field query configuration")
+
+    def test_prefilter_documents_returns_none_for_invalid_custom_field_query(self):
+        trigger = WorkflowTrigger.objects.create(
+            type=WorkflowTrigger.WorkflowTriggerType.DOCUMENT_ADDED,
+            filter_custom_field_query="{ not json",
+        )
+
+        Document.objects.create(
+            title="doc",
+            original_filename="doc.pdf",
+            checksum="checksum-prefilter-invalid",
+        )
+
+        filtered = prefilter_documents_by_workflowtrigger(
+            Document.objects.all(),
+            trigger,
+        )
+
+        self.assertEqual(list(filtered), [])
+
+    def test_prefilter_documents_applies_all_filters(self):
+        other_document_type = DocumentType.objects.create(name="Other Type")
+        other_storage_path = StoragePath.objects.create(
+            name="Blocked path",
+            path="/blocked/",
+        )
+
+        trigger = WorkflowTrigger.objects.create(
+            type=WorkflowTrigger.WorkflowTriggerType.DOCUMENT_ADDED,
+            filter_has_correspondent=self.c,
+            filter_has_document_type=self.dt,
+            filter_has_storage_path=self.sp,
+        )
+        trigger.filter_has_tags.set([self.t1])
+        trigger.filter_has_all_tags.set([self.t1, self.t2])
+        trigger.filter_has_not_tags.set([self.t3])
+        trigger.filter_has_not_correspondents.set([self.c2])
+        trigger.filter_has_not_document_types.set([other_document_type])
+        trigger.filter_has_not_storage_paths.set([other_storage_path])
+
+        allowed_document = Document.objects.create(
+            title="allowed",
+            correspondent=self.c,
+            document_type=self.dt,
+            storage_path=self.sp,
+            original_filename="allow.pdf",
+            checksum="checksum-prefilter-allowed",
+        )
+        allowed_document.tags.set([self.t1, self.t2])
+
+        blocked_document = Document.objects.create(
+            title="blocked",
+            correspondent=self.c2,
+            document_type=other_document_type,
+            storage_path=other_storage_path,
+            original_filename="block.pdf",
+            checksum="checksum-prefilter-blocked",
+        )
+        blocked_document.tags.set([self.t1, self.t3])
+
+        filtered = prefilter_documents_by_workflowtrigger(
+            Document.objects.all(),
+            trigger,
+        )
+
+        self.assertIn(allowed_document, filtered)
+        self.assertNotIn(blocked_document, filtered)
+
     def test_document_added_no_match_doctype(self):
         trigger = WorkflowTrigger.objects.create(
             type=WorkflowTrigger.WorkflowTriggerType.DOCUMENT_ADDED,