diff --git a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/TypedHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/TypedHandler.java
index 16a9ae0f7ead..e35a477054a6 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/TypedHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/TypedHandler.java
@@ -31,6 +31,7 @@ import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.editor.EditorModificationUtil;
 import com.intellij.openapi.editor.actionSystem.TypedActionHandler;
 import com.intellij.openapi.extensions.Extensions;
+import com.intellij.openapi.fileEditor.FileDocumentManager;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -54,6 +55,10 @@ public class TypedHandler implements TypedActionHandler {
         return;
       }
 
+      if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), editor.getProject())) {
+         return;
+      }
+
       final CharFilter.Result result = getLookupAction(charTyped, lookup);
       lookup.performGuardedChange(new Runnable() {
         public void run() {
diff --git a/platform/platform-api/src/com/intellij/openapi/fileEditor/FileDocumentManager.java b/platform/platform-api/src/com/intellij/openapi/fileEditor/FileDocumentManager.java
index 243ad6dd4cfd..3e9b78830fe3 100644
--- a/platform/platform-api/src/com/intellij/openapi/fileEditor/FileDocumentManager.java
+++ b/platform/platform-api/src/com/intellij/openapi/fileEditor/FileDocumentManager.java
@@ -68,7 +68,7 @@ public abstract class FileDocumentManager {
    * @return true if writing access allowed
    * @see com.intellij.openapi.vfs.ReadonlyStatusHandler#ensureFilesWritable(com.intellij.openapi.project.Project, com.intellij.openapi.vfs.VirtualFile...)
    */
-  public abstract boolean requestWriting(@NotNull Document document, Project project);
+  public abstract boolean requestWriting(@NotNull Document document, @Nullable Project project);
 
   public static boolean fileForDocumentCheckedOutSuccessfully(@NotNull Document document, @NotNull Project project) {
     return getInstance().requestWriting(document, project);