diff --git a/plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreDatabase.java b/plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreDatabase.java
index 9594de02a032a75b4c2dd8ea7e77f299b1a6b1b4..6f1ee2421683b4d06bd08a67e38e8a8874783137 100644
--- a/plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreDatabase.java
+++ b/plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreDatabase.java
@@ -44,6 +44,7 @@ import org.jkiss.dbeaver.model.struct.rdb.DBSCatalog;
 
 import java.sql.SQLException;
 import java.util.Collection;
+import java.util.Collections;
 
 /**
  * PostgreDatabase
@@ -399,7 +400,7 @@ public class PostgreDatabase implements DBSInstance, DBSCatalog, DBPRefreshableO
             throws SQLException
         {
             return session.prepareStatement(
-                "SELECT a.oid,a.* FROM pg_catalog.pg_authid a " +
+                "SELECT a.oid,a.* FROM pg_catalog.pg_authid1 a " +
                     "\nORDER BY a.oid"
             );
         }
@@ -410,6 +411,17 @@ public class PostgreDatabase implements DBSInstance, DBSCatalog, DBPRefreshableO
         {
             return new PostgreAuthId(owner, dbResult);
         }
+
+        @Override
+        protected boolean handleCacheReadError(DBException error) {
+            // #271: in some databases (AWS?) pg_authid is not accessible
+//            if (PostgreConstants.EC_PERMISSION_DENIED.equals(error.getDatabaseState())) {
+//                log.warn(error);
+                setCache(Collections.<PostgreAuthId>emptyList());
+//                return true;
+//            }
+            return false;
+        }
     }
 
     class AccessMethodCache extends JDBCObjectCache<PostgreDatabase, PostgreAccessMethod> {
diff --git a/plugins/org.jkiss.dbeaver.model/src/org/jkiss/dbeaver/model/impl/jdbc/cache/JDBCObjectCache.java b/plugins/org.jkiss.dbeaver.model/src/org/jkiss/dbeaver/model/impl/jdbc/cache/JDBCObjectCache.java
index 0ad7496aa36ef3d9de9f195bbc15d5f242edba2a..dda3cd3ed83f7932ba3575b6d3821d668e658097 100644
--- a/plugins/org.jkiss.dbeaver.model/src/org/jkiss/dbeaver/model/impl/jdbc/cache/JDBCObjectCache.java
+++ b/plugins/org.jkiss.dbeaver.model/src/org/jkiss/dbeaver/model/impl/jdbc/cache/JDBCObjectCache.java
@@ -84,35 +84,40 @@ public abstract class JDBCObjectCache<OWNER extends DBSObject, OBJECT extends DB
         if (dataSource == null) {
             throw new DBException("Not connected to database");
         }
-        try (JDBCSession session = DBUtils.openMetaSession(monitor, dataSource, "Load objects from " + owner.getName())) {
-            try (JDBCStatement dbStat = prepareObjectsStatement(session, owner)) {
-                monitor.subTask("Execute query");
-                dbStat.setFetchSize(DBConstants.METADATA_FETCH_SIZE);
-                dbStat.executeStatement();
-                JDBCResultSet dbResult = dbStat.getResultSet();
-                if (dbResult != null) {
-                    try {
-                        while (dbResult.next()) {
-                            if (monitor.isCanceled()) {
-                                break;
+        try {
+            try (JDBCSession session = DBUtils.openMetaSession(monitor, dataSource, "Load objects from " + owner.getName())) {
+                try (JDBCStatement dbStat = prepareObjectsStatement(session, owner)) {
+                    monitor.subTask("Execute query");
+                    dbStat.setFetchSize(DBConstants.METADATA_FETCH_SIZE);
+                    dbStat.executeStatement();
+                    JDBCResultSet dbResult = dbStat.getResultSet();
+                    if (dbResult != null) {
+                        try {
+                            while (dbResult.next()) {
+                                if (monitor.isCanceled()) {
+                                    break;
+                                }
+
+                                OBJECT object = fetchObject(session, owner, dbResult);
+                                if (object == null) {
+                                    continue;
+                                }
+                                tmpObjectList.add(object);
+
+                                monitor.subTask(object.getName());
                             }
-
-                            OBJECT object = fetchObject(session, owner, dbResult);
-                            if (object == null) {
-                                continue;
-                            }
-                            tmpObjectList.add(object);
-
-                            monitor.subTask(object.getName());
+                        } finally {
+                            dbResult.close();
                         }
-                    } finally {
-                        dbResult.close();
                     }
                 }
+            } catch (SQLException ex) {
+                throw new DBException(ex, dataSource);
+            }
+        } catch (DBException e) {
+            if (!handleCacheReadError(e)) {
+                throw e;
             }
-        }
-        catch (SQLException ex) {
-            throw new DBException(ex, dataSource);
         }
 
         Comparator<OBJECT> comparator = getListOrderComparator();
@@ -127,5 +132,10 @@ public abstract class JDBCObjectCache<OWNER extends DBSObject, OBJECT extends DB
         }
     }
 
+    // Can be implemented to provide custom cache error handler
+    protected boolean handleCacheReadError(DBException error) {
+        return false;
+    }
+
 
 }