1 files changed, 8 insertions, 2 deletions
diff --git a/platform/lang-impl/src/com/intellij/refactoring/BaseRefactoringProcessor.java b/platform/lang-impl/src/com/intellij/refactoring/BaseRefactoringProcessor.java
index f83dcfe4788f..93921cd6c1dc 100644
--- a/platform/lang-impl/src/com/intellij/refactoring/BaseRefactoringProcessor.java
+++ b/platform/lang-impl/src/com/intellij/refactoring/BaseRefactoringProcessor.java
@@ -431,8 +431,14 @@ public abstract class BaseRefactoringProcessor implements Runnable {
       final Runnable prepareHelpersRunnable = new Runnable() {
         @Override
         public void run() {
-          for (RefactoringHelper helper : Extensions.getExtensions(RefactoringHelper.EP_NAME)) {
-            preparedData.put(helper, helper.prepareOperation(writableUsageInfos));
+          for (final RefactoringHelper helper : Extensions.getExtensions(RefactoringHelper.EP_NAME)) {
+            Object operation = ApplicationManager.getApplication().runReadAction(new Computable<Object>() {
+              @Override
+              public Object compute() {
+                return helper.prepareOperation(writableUsageInfos);
+              }
+            });
+            preparedData.put(helper, operation);
           }
         }
       };