diff --git a/application/src/main/java/org/opentripplanner/inspector/vector/edge/EdgePropertyMapper.java b/application/src/main/java/org/opentripplanner/inspector/vector/edge/EdgePropertyMapper.java
index 13956af99c4..83b677a62ce 100644
--- a/application/src/main/java/org/opentripplanner/inspector/vector/edge/EdgePropertyMapper.java
+++ b/application/src/main/java/org/opentripplanner/inspector/vector/edge/EdgePropertyMapper.java
@@ -24,7 +24,7 @@ protected Collection<KeyValue> map(Edge input) {
         case StreetEdge e -> mapStreetEdge(e);
         case EscalatorEdge e -> List.of(
           kv("distance", e.getDistanceMeters()),
-          kv("duration", e.getDuration())
+          kv("duration", e.getDuration().map(d -> d.toString()).orElse(null))
         );
         default -> List.of();
       };
diff --git a/utils/src/main/java/org/opentripplanner/utils/time/DurationUtils.java b/utils/src/main/java/org/opentripplanner/utils/time/DurationUtils.java
index 78a6ae16885..d73faecee03 100644
--- a/utils/src/main/java/org/opentripplanner/utils/time/DurationUtils.java
+++ b/utils/src/main/java/org/opentripplanner/utils/time/DurationUtils.java
@@ -11,7 +11,6 @@
 import java.util.Optional;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
-import org.opentripplanner.utils.lang.StringUtils;
 
 /**
  * This class extend the Java {@link Duration} with utility functionality to parse and convert