diff --git a/xml/dom-openapi/src/com/intellij/util/xml/DomUtil.java b/xml/dom-openapi/src/com/intellij/util/xml/DomUtil.java
index d536836f9387..d62d99752e75 100644
--- a/xml/dom-openapi/src/com/intellij/util/xml/DomUtil.java
+++ b/xml/dom-openapi/src/com/intellij/util/xml/DomUtil.java
@@ -228,7 +228,9 @@ public class DomUtil {
           if (!attribute.isValid()) {
             throw new AssertionError("Invalid attr: parent.valid=" + tag.isValid());
           }
-          ContainerUtil.addIfNotNull(domManager.getDomElement(attribute), result);
+          GenericAttributeValue element = domManager.getDomElement(attribute);
+          checkHasXml(attribute, element);
+          ContainerUtil.addIfNotNull(element, result);
         }
       }
       if (tags) {
@@ -236,7 +238,9 @@ public class DomUtil {
           if (!subTag.isValid()) {
             throw new AssertionError("Invalid subtag: parent.valid=" + tag.isValid());
           }
-          ContainerUtil.addIfNotNull(domManager.getDomElement(subTag), result);
+          DomElement element = domManager.getDomElement(subTag);
+          checkHasXml(subTag, element);
+          ContainerUtil.addIfNotNull(element, result);
         }
       }
       return result;
@@ -244,6 +248,12 @@ public class DomUtil {
     return Collections.emptyList();
   }
 
+  private static void checkHasXml(XmlElement psi, DomElement dom) {
+    if (dom != null && dom.getXmlElement() == null) {
+      throw new AssertionError("No xml for dom " + dom + "; attr=" + psi + ", physical=" + psi.isPhysical());
+    }
+  }
+
   public static <T> List<T> getDefinedChildrenOfType(@NotNull final DomElement parent, final Class<T> type, boolean tags, boolean attributes) {
     return ContainerUtil.findAll(getDefinedChildren(parent, tags, attributes), type);
   }
diff --git a/xml/dom-openapi/src/com/intellij/util/xml/highlighting/DomElementsInspection.java b/xml/dom-openapi/src/com/intellij/util/xml/highlighting/DomElementsInspection.java
index d4692d5acc87..18a8a13a0eff 100644
--- a/xml/dom-openapi/src/com/intellij/util/xml/highlighting/DomElementsInspection.java
+++ b/xml/dom-openapi/src/com/intellij/util/xml/highlighting/DomElementsInspection.java
@@ -80,7 +80,7 @@ public abstract class DomElementsInspection<T extends DomElement> extends XmlSup
       for (final DomElement child : DomUtil.getDefinedChildren(element, true, true)) {
         final XmlElement element1 = child.getXmlElement();
         if (element1 == null) {
-          LOG.error("child=" + child + "; parent=" + element);
+          LOG.error("child=" + child + " of class " + child.getClass() + "; parent=" + element);
         }
         if (element1.isPhysical()) {
           visitor.consume(child);