diff --git a/sru/almasru.py b/sru/almasru.py
index 1226453cf2c9fb622493312b2adbd3687bbccad5..df882e10c5a769f837f2e4639f13a57881486cdc 100644
--- a/sru/almasru.py
+++ b/sru/almasru.py
@@ -127,7 +127,7 @@ class RecordRetriever:
             sru_url = self._create_url(alma_query, startrecord)
             sru_xml = self._response_to_xml(sru_url)
 
-            self._raise_error_sru()
+            self._raise_error_sru(sru_xml)
             xml_list.extend(self._extract_marc_xml(sru_xml))
 
         return xml_list
diff --git a/sru/onbsru.py b/sru/onbsru.py
index 377ef74e6aad0eea9c8bc7423d1786904038057e..556d1244c0e0a09023eec1b2df5c348d072fcf32 100644
--- a/sru/onbsru.py
+++ b/sru/onbsru.py
@@ -16,6 +16,7 @@ class OnbRecordRetriever(almasru.RecordRetriever):
 
         self.namespaces = {
             'srw': 'http://www.loc.gov/zing/srw/',
+            'diag': 'http://www.loc.gov/zing/srw/diagnostic',
             'marc': 'http://www.loc.gov/MARC21/slim'
         }
 
@@ -52,4 +53,4 @@ class OnbRecordRetriever(almasru.RecordRetriever):
 
     def _get_subfield(self, element, subfield):
         xpath = "marc:subfield[@code='"+subfield+"']"
-        return element.find(xpath, self.namespaces)
\ No newline at end of file
+        return element.find(xpath, self.namespaces)