From 2b76ff857a07f3f098581701e8e00c39c311a013 Mon Sep 17 00:00:00 2001
From: "andreas.schildbach"
 <andreas.schildbach@0924bc21-9374-b0fa-ee44-9ff1593b38f0>
Date: Wed, 28 Jul 2010 18:05:41 +0000
Subject: [PATCH] sanity check

git-svn-id: https://public-transport-enabler.googlecode.com/svn/trunk@34 0924bc21-9374-b0fa-ee44-9ff1593b38f0
---
 src/de/schildbach/pte/NetworkProviderFactory.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/de/schildbach/pte/NetworkProviderFactory.java b/src/de/schildbach/pte/NetworkProviderFactory.java
index f454c35e..bacb319a 100644
--- a/src/de/schildbach/pte/NetworkProviderFactory.java
+++ b/src/de/schildbach/pte/NetworkProviderFactory.java
@@ -106,7 +106,9 @@ public final class NetworkProviderFactory
 
 	public static String networkId(final NetworkProvider provider)
 	{
-		if (provider instanceof VbbProvider)
+		if (provider == null)
+			throw new IllegalArgumentException("null provider");
+		else if (provider instanceof VbbProvider)
 			return VbbProvider.NETWORK_ID;
 		else if (provider instanceof RmvProvider)
 			return RmvProvider.NETWORK_ID;