diff --git a/java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/projectRoot/BaseLibrariesConfigurable.java b/java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/projectRoot/BaseLibrariesConfigurable.java
index 6b8ba82c2ca9..163394ca6b14 100644
--- a/java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/projectRoot/BaseLibrariesConfigurable.java
+++ b/java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/projectRoot/BaseLibrariesConfigurable.java
@@ -102,6 +102,7 @@ public abstract class BaseLibrariesConfigurable extends BaseStructureConfigurabl
   @Override
   public void checkCanApply() throws ConfigurationException {
     super.checkCanApply();
+    checkForEmptyAndDuplicatedNames("Library", CommonBundle.getErrorTitle(), LibraryConfigurable.class);
     for (LibraryConfigurable configurable : getLibraryConfigurables()) {
       if (configurable.getDisplayName().isEmpty()) {
         ((LibraryProjectStructureElement)configurable.getProjectStructureElement()).navigate();