Solve "StackOverflowException" on TransactionPartnerTypeAdapter when …

…the object is of an incompatible type

library/src/main/java/com/pengrad/telegrambot/model/stars/partner/TransactionPartnerUnknown.java

@@ -0,0 +1,29 @@
+package com.pengrad.telegrambot.model.stars.partner;
+
+import com.pengrad.telegrambot.model.stars.withdrawal.RevenueWithdrawalState;
+
+import java.util.Objects;
+
+public class TransactionPartnerUnknown extends TransactionPartner {
+
+    public final static String TYPE = "unknown";
+
+    public TransactionPartnerUnknown() {
+        super(TYPE);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return "TransactionPartnerUnknown{" +
+                "type='" + type() + "\'" +
+                '}';
+    }
+
+}

library/src/main/java/com/pengrad/telegrambot/utility/gson/TransactionPartnerTypeAdapter.java

@@ -26,6 +26,6 @@ public TransactionPartner deserialize(JsonElement element, Type type, JsonDeseri
             return context.deserialize(object, TransactionPartnerOther.class);
         }
 
-        return context.deserialize(object, TransactionPartner.class);
+        return new TransactionPartnerUnknown();
     }
 }