Index: src/java/jdbc_adapter/JdbcAdapterInternalService.java
===================================================================
--- src/java/jdbc_adapter/JdbcAdapterInternalService.java	(revision 1029)
+++ src/java/jdbc_adapter/JdbcAdapterInternalService.java	(working copy)
@@ -411,7 +411,7 @@
     @JRubyMethod(name = "rollback")
     public static IRubyObject rollback(IRubyObject recv) throws SQLException {
         Connection c = getConnection(recv);
-        if (!c.getAutoCommit()) {
+        if (c != null && !c.getAutoCommit()) {
             try {
                 c.rollback();
             } finally {