Index: trunk/scripts/SyncEditorLayerIndex.java
===================================================================
--- trunk/scripts/SyncEditorLayerIndex.java	(revision 18801)
+++ trunk/scripts/SyncEditorLayerIndex.java	(revision 18989)
@@ -1,3 +1,4 @@
 // License: GPL. For details, see LICENSE file.
+
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.apache.commons.lang3.StringUtils.isBlank;
@@ -38,12 +39,4 @@
 import java.util.stream.Collectors;
 
-import jakarta.json.Json;
-import jakarta.json.JsonArray;
-import jakarta.json.JsonNumber;
-import jakarta.json.JsonObject;
-import jakarta.json.JsonReader;
-import jakarta.json.JsonString;
-import jakarta.json.JsonValue;
-
 import org.openstreetmap.gui.jmapviewer.Coordinate;
 import org.openstreetmap.josm.data.Preferences;
@@ -66,4 +59,12 @@
 import org.openstreetmap.josm.tools.Utils;
 import org.xml.sax.SAXException;
+
+import jakarta.json.Json;
+import jakarta.json.JsonArray;
+import jakarta.json.JsonNumber;
+import jakarta.json.JsonObject;
+import jakarta.json.JsonReader;
+import jakarta.json.JsonString;
+import jakarta.json.JsonValue;
 
 /**
@@ -500,4 +501,7 @@
 
         for (ImageryInfo e : josmEntries) {
+            if (!e.isValid()) {
+                myprintln("~~~ JOSM-Entry missing fields (" + String.join(", ", e.getMissingFields()) + "): " + getDescription(e));
+            }
             if (isBlank(getUrl(e))) {
                 myprintln("~~~ JOSM-Entry without URL: " + getDescription(e));