diff --git a/Mage.Server/src/main/java/mage/server/UserManager.java b/Mage.Server/src/main/java/mage/server/UserManager.java
index c1cf20b528..030858f0ce 100644
--- a/Mage.Server/src/main/java/mage/server/UserManager.java
+++ b/Mage.Server/src/main/java/mage/server/UserManager.java
@@ -58,7 +58,7 @@ public enum UserManager {
 
     public Optional<User> getUser(UUID userId) {
         if (!users.containsKey(userId)) {
-            logger.warn(String.format("User with id %s could not be found", userId));;
+            logger.warn(String.format("User with id %s could not be found", userId), new Throwable()); // TODO: remove after session freezes fixed
             return Optional.empty();
         } else {
             return Optional.of(users.get(userId));