From 4efae5362139287071744754aacd524449345204 Mon Sep 17 00:00:00 2001
From: Michael Bayne <mdb@samskivert.com>
Date: Fri, 2 May 2014 13:13:11 -0700
Subject: [PATCH] Handle null uniqueColumns.

---
 src/main/java/com/samskivert/jdbc/HsqldbLiaison.java | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/main/java/com/samskivert/jdbc/HsqldbLiaison.java b/src/main/java/com/samskivert/jdbc/HsqldbLiaison.java
index 82c3f8ad..125e812a 100644
--- a/src/main/java/com/samskivert/jdbc/HsqldbLiaison.java
+++ b/src/main/java/com/samskivert/jdbc/HsqldbLiaison.java
@@ -129,9 +129,11 @@ public class HsqldbLiaison extends BaseLiaison
 
         // note the set of single column unique constraints already provided (see method comment)
         Set<String> seenUniques = new HashSet<String>();
-        for (List<String> udef : uniqueColumns) {
-            if (udef.size() == 1) {
-                seenUniques.addAll(udef);
+        if (uniqueColumns != null) {
+            for (List<String> udef : uniqueColumns) {
+                if (udef.size() == 1) {
+                    seenUniques.addAll(udef);
+                }
             }
         }
         // primary key columns are also considered implicitly unique as of HSQL 2.2.4, and it will