diff --git a/java/java-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/manipulators/StringLiteralManipulator.java b/java/java-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/manipulators/StringLiteralManipulator.java
index 342e7da61776..6fa82762c7d7 100644
--- a/java/java-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/manipulators/StringLiteralManipulator.java
+++ b/java/java-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/manipulators/StringLiteralManipulator.java
@@ -28,7 +28,8 @@ import com.intellij.util.IncorrectOperationException;
  */
 public class StringLiteralManipulator extends AbstractElementManipulator<PsiLiteralExpression> {
   public PsiLiteralExpression handleContentChange(PsiLiteralExpression expr, TextRange range, String newContent) throws IncorrectOperationException {
-    if (!(expr.getValue() instanceof String)) throw new IncorrectOperationException("cannot handle content change");
+    final Object value = expr.getValue();
+    if (!(value instanceof String)) throw new IncorrectOperationException("cannot handle content change for: "+ value);
     String oldText = expr.getText();
     newContent = StringUtil.escapeStringCharacters(newContent);
     String newText = oldText.substring(0, range.getStartOffset()) + newContent + oldText.substring(range.getEndOffset());