check type before casting

1 files changed, 3 insertions, 0 deletions

diff --git a/document/src/main/java/com/yahoo/document/datatypes/FieldPathIteratorHandler.java b/document/src/main/java/com/yahoo/document/datatypes/FieldPathIteratorHandler.java
index 726deb18859..47c7b5b4d94 100644
--- a/document/src/main/java/com/yahoo/document/datatypes/FieldPathIteratorHandler.java
+++ b/document/src/main/java/com/yahoo/document/datatypes/FieldPathIteratorHandler.java
@@ -57,6 +57,9 @@ public abstract class FieldPathIteratorHandler {
 
         @Override
         public boolean equals(Object o) {
+            if (!(o instanceof IndexValue)) {
+                return false;
+            }
             IndexValue other = (IndexValue)o;
             if (key != null && other.key != null) {
                 return key.equals(other.key);