Fix crash

validata_core/__init__.py

@@ -229,16 +229,17 @@ def repair_core(dataset: tablib.Dataset, schema_field_names):
                        for col_id in empty_header_cols])
 
     # Compare ordering
-    schema_order_extract = [h for h in schema_field_names if h in content_dataset.headers]
-    if content_dataset.headers != schema_order_extract:
-        report.append(goodtables.Error(code='wrong-headers-order',
-                                       message_substitutions={'actual-order': content_dataset.headers,
-                                                              'wanted-order': schema_order_extract}))
+    if content_dataset.headers:
+        schema_order_extract = [h for h in schema_field_names if h in content_dataset.headers]
+        if content_dataset.headers != schema_order_extract:
+            report.append(goodtables.Error(code='wrong-headers-order',
+                                           message_substitutions={'actual-order': content_dataset.headers,
+                                                                  'wanted-order': schema_order_extract}))
 
     # Then reorder and create empty columns if no content found
     fixed_dataset = tablib.Dataset()
     for h in schema_field_names:
-        if h in content_dataset.headers:
+        if content_dataset.headers and h in content_dataset.headers:
             col_id = content_dataset.headers.index(h)
             append_col(fixed_dataset, content_dataset.get_col(col_id), h)
         else: