diff --git a/parser/db.py b/parser/db.py
index daee31f..cba9b41 100644
--- a/parser/db.py
+++ b/parser/db.py
@@ -139,6 +139,26 @@ def get_parent_message_body(self, msg_hash) -> str:
                 if not res:
                     return None
                 return res['body_boc']
+            
+    """
+    Returns True if parent message exists (i.e there is an internal message A which triggered a transactions T resulted in sending the current message M: ...A->T->M)
+    or False if the current message is the first messages in the transaction chain initiated by external message: ext->T->M
+    or throws an exception if trace_edges table does not contain the message
+    """
+    def parent_message_exists(self, msg_hash) -> bool:
+        assert self.conn is not None
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
+            cursor.execute(
+                    """
+                    select trace_id, left_tx from trace_edges te
+                    where te.msg_hash = %s
+                    """, 
+                    (msg_hash, ),
+                ) 
+            res = cursor.fetchone()
+            if not res:
+                raise Exception(f"trace_edges table does not contain the message {msg_hash}")
+            return res['trace_id'] != res['left_tx']
 
     """
     Returns parent message with message body
diff --git a/parser/parsers/message/jetton_mint.py b/parser/parsers/message/jetton_mint.py
index 84c8a74..a66be15 100644
--- a/parser/parsers/message/jetton_mint.py
+++ b/parser/parsers/message/jetton_mint.py
@@ -29,7 +29,7 @@ def topics(self):
         return [TOPIC_MESSAGES]
 
     def predicate(self, obj: dict) -> bool:
-        return obj.get("opcode") == Parser.opcode_signed(0x178d4519) and obj.get("direction") == "in"
+        return obj.get("opcode") == Parser.opcode_signed(0x178d4519) and obj.get("direction") == "in" and obj.get("source") 
 
     def handle_internal(self, obj: dict, db: DB):
         # ensure we have no transfer operation before
@@ -37,6 +37,9 @@ def handle_internal(self, obj: dict, db: DB):
         if prev_message and prev_message.get("opcode") == Parser.opcode_signed(0x0f8a7ea5):
             # skip ordinary chain transfer => internal_transfer
             return
+        if not prev_message:
+            if db.parent_message_exists(obj.get("msg_hash")):
+                raise Exception(f"trace_edges table contains a parent messages but get_parent_message_with_body returned None")
 
         logger.info(f"Parsing jetton mint message {Parser.require(obj.get('msg_hash'))}")
         cell = Parser.message_body(obj, db).begin_parse()