1 files changed, 8 insertions, 4 deletions

diff --git a/src/uk/ac/ox/cs/pagoda/query/GapByTriple.java b/src/uk/ac/ox/cs/pagoda/query/GapByTriple.java
index 1a94f07..a1c1b0e 100644
--- a/src/uk/ac/ox/cs/pagoda/query/GapByTriple.java
+++ b/src/uk/ac/ox/cs/pagoda/query/GapByTriple.java
@@ -53,7 +53,7 @@ public class GapByTriple extends GapTupleIterator<String> {
         
         @Override
         public boolean hasNext() {
-                TupleIterator iter;
+                TupleIterator iter = null;
                 boolean inGap; 
                 StringBuffer queryBuffer = new StringBuffer();
                 try {
@@ -75,9 +75,13 @@ public class GapByTriple extends GapTupleIterator<String> {
                                 queryBuffer.setLength(0);
                                 queryBuffer.append("SELECT WHERE { ").append(sub).append(" ").append(predicate).append(" ").append(obj).append(" }");
 
-                                iter = lowerStore.compileQuery(queryBuffer.toString(), prefixes, parameters);
-                                inGap = iter.open() != 0;
-                                iter.dispose();
+                                try {
+                                        iter = lowerStore.compileQuery(queryBuffer.toString(), prefixes, parameters);
+                                        inGap = iter.open() != 0;
+                                } finally {
+                                        if (iter != null) iter.dispose();
+                                        iter = null; 
+                                }
                                 if (inGap) 
                                         return true;
                         }