check if session expired before generating more tags

libi2pd/ECIESX25519AEADRatchetSession.cpp

@@ -1010,10 +1010,13 @@ namespace garlic
 	}
 
 	void ECIESX25519AEADRatchetSession::GenerateMoreReceiveTags (std::shared_ptr<RatchetTagSet> receiveTagset, int numTags)
+	{
+		if (GetOwner ())
 		{	
 			for (int i = 0; i < numTags; i++)
 				GetOwner ()->AddECIESx25519SessionNextTag (receiveTagset);
 		}	
+	}
 
 	bool ECIESX25519AEADRatchetSession::CheckExpired (uint64_t ts)
 	{