Index: src/java/org/apache/commons/pool/composite/InvalidEvictorLender.java
===================================================================
--- src/java/org/apache/commons/pool/composite/InvalidEvictorLender.java	(revision 602588)
+++ src/java/org/apache/commons/pool/composite/InvalidEvictorLender.java	(working copy)
@@ -142,9 +142,11 @@
              */
             public void run() {
                 // Skip some synchronization if we can
-                if (referant == null) {
-                    cancel();
-                    return;
+                synchronized (InvalidEvictorReference.this) {
+	                if (referant == null) {
+	                    cancel();
+	                    return;
+	                }
                 }

                 final PoolableObjectFactory factory = getObjectPool().getFactory();