# HG changeset patch
# User Andreas Woess <andreas.woess@jku.at>
# Date 1329622120 -3600
# Node ID 2855c491e2bd993c0c73f6297b21d9677c352732
# Parent  a9181b59a6bfb9b10a20e0f55c5d242a7e58fe6b
Fix NPE in DebugValueMap.group

diff -r a9181b59a6bf -r 2855c491e2bd graal/com.oracle.max.graal.debug/src/com/oracle/max/graal/debug/internal/DebugValueMap.java
--- a/graal/com.oracle.max.graal.debug/src/com/oracle/max/graal/debug/internal/DebugValueMap.java	Fri Feb 17 16:03:09 2012 -0800
+++ b/graal/com.oracle.max.graal.debug/src/com/oracle/max/graal/debug/internal/DebugValueMap.java	Sun Feb 19 04:28:40 2012 +0100
@@ -140,10 +140,12 @@
     }
 
     public void group() {
-        List<DebugValueMap> oldChildren = new ArrayList<>(this.children);
-        this.children.clear();
-        for (DebugValueMap map : oldChildren) {
-            mergeWith(map);
+        if (this.hasChildren()) {
+            List<DebugValueMap> oldChildren = new ArrayList<>(this.children);
+            this.children.clear();
+            for (DebugValueMap map : oldChildren) {
+                mergeWith(map);
+            }
         }
     }
 }