CAMEL-7785: Fixed potential NPE.

Project: http://git-wip-us.apache.org/repos/asf/camel/repo
Commit: http://git-wip-us.apache.org/repos/asf/camel/commit/9df6d8f4
Tree: http://git-wip-us.apache.org/repos/asf/camel/tree/9df6d8f4
Diff: http://git-wip-us.apache.org/repos/asf/camel/diff/9df6d8f4

Branch: refs/heads/camel-2.13.x
Commit: 9df6d8f450d48145a8547c8a9b9925b74ef0f823
Parents: 8a67c02
Author: Claus Ibsen <davscl...@apache.org>
Authored: Sun Nov 30 16:49:38 2014 +0100
Committer: Claus Ibsen <davscl...@apache.org>
Committed: Sun Nov 30 16:51:17 2014 +0100

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 .../src/main/java/org/apache/camel/impl/DefaultExchange.java       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/camel/blob/9df6d8f4/camel-core/src/main/java/org/apache/camel/impl/DefaultExchange.java
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diff --git 
a/camel-core/src/main/java/org/apache/camel/impl/DefaultExchange.java 
b/camel-core/src/main/java/org/apache/camel/impl/DefaultExchange.java
index 164ae67..b020184 100644
--- a/camel-core/src/main/java/org/apache/camel/impl/DefaultExchange.java
+++ b/camel-core/src/main/java/org/apache/camel/impl/DefaultExchange.java
@@ -369,7 +369,7 @@ public final class DefaultExchange implements Exchange {
 
     public void setUnitOfWork(UnitOfWork unitOfWork) {
         this.unitOfWork = unitOfWork;
-        if (onCompletions != null) {
+        if (unitOfWork != null && onCompletions != null) {
             // now an unit of work has been assigned so add the on completions
             // we might have registered already
             for (Synchronization onCompletion : onCompletions) {

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