NPE while highlighting enum constant in annotation attribute

plugins/groovy/src/org/jetbrains/plugins/groovy/annotator/GroovyAnnotator.java

@@ -1374,14 +1374,21 @@ public class GroovyAnnotator extends GroovyElementVisitor {
     if (value instanceof GrReferenceExpression) {
       PsiElement resolved = ((GrReferenceExpression)value).resolve();
       if (resolved instanceof PsiClass) return false;
+      if (resolved instanceof PsiEnumConstant) return false;
 
       if (resolved instanceof GrAccessorMethod) resolved = ((GrAccessorMethod)resolved).getProperty();
       if (resolved instanceof PsiField) {
         GrExpression initializer;
         try {
-          initializer = resolved instanceof GrField
-                        ? ((GrField)resolved).getInitializerGroovy()
-                        : (GrExpression)ExpressionConverter.getExpression(((PsiField)resolved).getInitializer(), GroovyFileType.GROOVY_LANGUAGE, value.getProject());
+          if (resolved instanceof GrField) {
+            initializer = ((GrField)resolved).getInitializerGroovy();
+          }
+          else {
+            final PsiExpression _initializer = ((PsiField)resolved).getInitializer();
+            initializer = _initializer != null
+                          ? (GrExpression)ExpressionConverter.getExpression(_initializer, GroovyFileType.GROOVY_LANGUAGE, value.getProject())
+                          : null;
+          }
         }
         catch (IncorrectOperationException e) {
           initializer = null;

plugins/groovy/test/org/jetbrains/plugins/groovy/lang/highlighting/GroovyHighlightingTest.groovy

@@ -1333,4 +1333,33 @@ class B extends A {
 ''')
   }
 
+  void testEnumConstantAsAnnotationAttribute() {
+    testHighlighting('''\
+enum A {CONST}
+
+@interface I {
+    A foo()
+}
+
+@I(foo = A.CONST) //no error
+def bar
+''')
+  }
+
+  void testUnassignedFieldAsAnnotationAttribute() {
+    testHighlighting('''\
+interface A {
+  String CONST
+}
+
+@interface I {
+    String foo()
+}
+
+@I(foo = <error descr="Expected 'A.CONST' to be an inline constant">A.CONST</error>)
+def bar
+''')
+  }
+
+
 }