--- mozilla.orig/toolkit/components/url-classifier/src/nsUrlClassifierDBService.cpp.orig	2010-04-02 11:59:10.000000000 -0400
+++ mozilla/toolkit/components/url-classifier/src/nsUrlClassifierDBService.cpp	2010-05-14 12:37:22.000000000 -0400
@@ -3180,6 +3180,8 @@
 {
   LOG(("nsUrlClassifierDBServiceWorker::ApplyUpdate"));
 
+  if (mConnection) {
+
   if (NS_FAILED(mUpdateStatus)) {
     mConnection->RollbackTransaction();
   } else {
@@ -3189,6 +3191,8 @@
     }
   }
 
+  } // mConnection
+
   if (NS_SUCCEEDED(mUpdateStatus)) {
     // We have modified the db, we can't trust the set of clean
     // fragments or domains anymore.
@@ -3222,7 +3226,8 @@
   // We need to get the error code before ApplyUpdate, because it might
   // close/open the connection.
   PRInt32 errcode = SQLITE_OK;
-  mConnection->GetLastError(&errcode);
+  if (mConnection)
+    mConnection->GetLastError(&errcode);
 
   ApplyUpdate();