diff --git a/icoscp/src/icoscp/sparql/sparqls.py b/icoscp/src/icoscp/sparql/sparqls.py
index 414c433..2359785 100644
--- a/icoscp/src/icoscp/sparql/sparqls.py
+++ b/icoscp/src/icoscp/sparql/sparqls.py
@@ -446,7 +446,7 @@ def station_query(filter: dict = None, return_filter: bool = False) -> str or (s
         prefix xsd: <http://www.w3.org/2001/XMLSchema#>
         prefix cpmeta: <http://meta.icos-cp.eu/ontologies/cpmeta/>
         prefix cpst: <http://meta.icos-cp.eu/ontologies/stationentry/>
-        select ?uri ?id ?name ?icosClass ?country ?lat ?lon ?elevation ?stationTheme ?firstName ?lastName ?email ?siteType
+        select distinct ?uri ?id ?name ?icosClass ?country ?lat ?lon ?elevation ?stationTheme ?firstName ?lastName ?email ?siteType
         from <http://meta.icos-cp.eu/resources/icos/>
         from <http://meta.icos-cp.eu/resources/extrastations/>
         from <http://meta.icos-cp.eu/resources/cpmeta/>
@@ -461,7 +461,8 @@ def station_query(filter: dict = None, return_filter: bool = False) -> str or (s
                     ?uri a ?stationTheme .
                     OPTIONAL{{
                         ?memb cpmeta:atOrganization ?uri ; cpmeta:hasRole <http://meta.icos-cp.eu/resources/roles/PI> .
-                        filter not exists {{?memb cpmeta:hasEndTime []}}
+                        optional {{?memb cpmeta:hasEndTime ?membEnd}}
+                        filter(!bound(?membEnd) || ?membEnd > now())
                         ?pers cpmeta:hasMembership ?memb
                     }}
                 }}
diff --git a/icoscp/src/icoscp/station/station.py b/icoscp/src/icoscp/station/station.py
index e2ccc0a..89ffed7 100644
--- a/icoscp/src/icoscp/station/station.py
+++ b/icoscp/src/icoscp/station/station.py
@@ -568,7 +568,7 @@ def get(stationId: str = None,
     except:
         stn = None
 
-    if not (isinstance(stn, pd.DataFrame) and not stn.empty):
+    if not isinstance(stn, pd.DataFrame) or stn.empty:
         my_stn.stationId = stationId
         my_stn.valid = False
         return my_stn
@@ -715,6 +715,7 @@ def _get_id_list(filter: dict = {'project': 'ICOS', 'theme': ['AS', 'ES', 'OS']}
 
     query = sparqls.station_query(filter=filter)
     stn_df = RunSparql(query, 'pandas').run()
+    stn_df.drop_duplicates(inplace=True)
 
     if not isinstance(stn_df, pd.DataFrame):
         return stn_df