diff --git a/core/src/main/java/hudson/model/LoadBalancer.java b/core/src/main/java/hudson/model/LoadBalancer.java
index d2016c3b7e8f2c7e9b8d27aa9dfce957b260138f..37446a181ed9d82a0824e09823afed5f84de112f 100644
--- a/core/src/main/java/hudson/model/LoadBalancer.java
+++ b/core/src/main/java/hudson/model/LoadBalancer.java
@@ -36,6 +36,8 @@ import hudson.util.ConsistentHash.Hash;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * Strategy that decides which {@link Task} gets run on which {@link Executor}.
@@ -116,6 +118,7 @@ public abstract class LoadBalancer implements ExtensionPoint {
             try {
                 key = task.getAffinityKey();
             } catch (RuntimeException e) {
+                LOGGER.log(Level.FINE, null, e);
                 // Default implementation of Queue.Task.getAffinityKey, we assume it doesn't fail.
                 key = task.getFullDisplayName();
             }
@@ -174,4 +177,6 @@ public abstract class LoadBalancer implements ExtensionPoint {
         };
     }
 
+    private static final Logger LOGGER = Logger.getLogger(LoadBalancer.class.getName());
+
 }