Merge pull request #2846 from kubikrubikvkube/master

Singleton object should not have map with values that can't be GCed

Mage.Server/src/main/java/mage/server/Session.java

@@ -425,7 +425,7 @@ public class Session {
         Throwable t = cause;
         while (t.getCause() != null) {
             t = t.getCause();
-            if (t == cause) {
+            if (Objects.equals(t, cause)) {
                 throw new IllegalArgumentException("Infinite cycle detected in causal chain");
             }
         }