diff --git a/platform/vcs-log/impl/src/com/intellij/vcs/log/data/VcsUserRegistryImpl.java b/platform/vcs-log/impl/src/com/intellij/vcs/log/data/VcsUserRegistryImpl.java
index 58896e5f8f5f..89b6582bd6cc 100644
--- a/platform/vcs-log/impl/src/com/intellij/vcs/log/data/VcsUserRegistryImpl.java
+++ b/platform/vcs-log/impl/src/com/intellij/vcs/log/data/VcsUserRegistryImpl.java
@@ -81,7 +81,9 @@ public class VcsUserRegistryImpl implements Disposable, VcsUserRegistry {
   @NotNull
   @Override
   public VcsUser createUser(@NotNull String name, @NotNull String email) {
-    return myInterner.intern(new VcsUserImpl(name, email));
+    synchronized (myInterner) {
+      return myInterner.intern(new VcsUserImpl(name, email));
+    }
   }
 
   public void addUser(@NotNull VcsUser user) {