Fix #2777

server/util-server.js

@@ -292,6 +292,12 @@ exports.postgresQuery = function (connectionString, query) {
                 client.end();
             } else {
                 // Connected here
+                try {
+                    // No query provided by user, use SELECT 1
+                    if (!query || (typeof query === "string" && query.trim() === "")) {
+                        query = "SELECT 1";
+                    }
+
                     client.query(query, (err, res) => {
                         if (err) {
                             reject(err);
@@ -300,6 +306,9 @@ exports.postgresQuery = function (connectionString, query) {
                         }
                         client.end();
                     });
+                } catch (e) {
+                    reject(e);
+                }
             }
         });