diff --git a/src/documents/serialisers.py b/src/documents/serialisers.py
index ea4f17d53..48e26dea3 100644
--- a/src/documents/serialisers.py
+++ b/src/documents/serialisers.py
@@ -1880,17 +1880,10 @@ class TrashSerializer(SerializerWithPerms):
         write_only=True,
     )
 
-    def _validate_document_id_list(self, documents, name="documents"):
-        if not isinstance(documents, list):
-            raise serializers.ValidationError(f"{name} must be a list")
-        if not all(isinstance(i, int) for i in documents):
-            raise serializers.ValidationError(f"{name} must be a list of integers")
+    def validate_documents(self, documents):
         count = Document.deleted_objects.filter(id__in=documents).count()
         if not count == len(documents):
             raise serializers.ValidationError(
-                f"Some documents in {name} have not yet been deleted.",
+                "Some documents in the list have not yet been deleted.",
             )
-
-    def validate_documents(self, documents):
-        self._validate_document_id_list(documents)
         return documents
diff --git a/src/documents/tests/test_api_trash.py b/src/documents/tests/test_api_trash.py
index 45a6a43d0..90d78610f 100644
--- a/src/documents/tests/test_api_trash.py
+++ b/src/documents/tests/test_api_trash.py
@@ -126,3 +126,30 @@ class TestTrashAPI(APITestCase):
         )
         self.assertEqual(resp.status_code, status.HTTP_403_FORBIDDEN)
         self.assertEqual(Document.global_objects.count(), 1)
+
+    def test_api_trash_invalid_params(self):
+        """
+        GIVEN:
+            - Existing documents
+        WHEN:
+            - API request to trash with invalid params
+        THEN:
+            - 400 Bad Request
+        """
+
+        document = Document.objects.create(
+            title="Title",
+            content="content",
+            checksum="checksum",
+            mime_type="application/pdf",
+        )
+
+        self.client.force_login(user=self.user)
+
+        # document isn't in trash
+        resp = self.client.post(
+            "/api/trash/",
+            {"action": "restore", "documents": [document.pk]},
+        )
+        self.assertEqual(resp.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertIn("have not yet been deleted", resp.data["documents"][0])