diff --git a/src/lib/connectors/postgres/index.ts b/src/lib/connectors/postgres/index.ts
index 692b838..66e9aee 100644
--- a/src/lib/connectors/postgres/index.ts
+++ b/src/lib/connectors/postgres/index.ts
@@ -23,14 +23,30 @@ const newPostgresClient = async (connection: Connection) => {
       key: connection.ssl?.key,
     };
   } else {
-    // rejectUnauthorized=false to infer sslmode=prefer since hosted PG venders have SSL enabled.
     clientConfig.ssl = {
       rejectUnauthorized: false,
     };
   }
 
   let client = new Client(clientConfig);
-  await client.connect();
+
+  if (connection.ssl) {
+    await client.connect();
+  } else {
+    try {
+      await client.connect();
+    } catch (error) {
+      // Because node-postgres didn't implement `sslmode: preferred`. So first try to connect via SSL, otherwise connect via non-SSL.
+      // Connecting postgres via non-ssl requires `clientConfig.ssl` is undefined. ref: https://github.com/sqlchat/sqlchat/issues/108
+      if (error instanceof Error && error.message.includes("The server does not support SSL connections")) {
+        clientConfig.ssl = undefined;
+        client = new Client(clientConfig);
+        await client.connect();
+      } else {
+        throw error;
+      }
+    }
+  }
   return client;
 };