diff --git a/3rdParty/LightPcapNg/LightPcapNg/src/light_pcapng_ext.c b/3rdParty/LightPcapNg/LightPcapNg/src/light_pcapng_ext.c
index f31b6ced2a..427cdf000f 100644
--- a/3rdParty/LightPcapNg/LightPcapNg/src/light_pcapng_ext.c
+++ b/3rdParty/LightPcapNg/LightPcapNg/src/light_pcapng_ext.c
@@ -461,6 +461,8 @@ int light_get_next_packet(light_pcapng_t *pcapng, light_packet_header *packet_he
 		packet_header->timestamp.tv_nsec = 0;
 		if (pcapng->file_info->interface_block_count > 0)
 			packet_header->data_link = pcapng->file_info->link_types[0];
+		else
+			packet_header->data_link = 0xFFFF; /* unknown/invalid link type sentinel (no interface block present) */
 
 		*packet_data = (uint8_t*)spb->packet_data;
 	}
diff --git a/Pcap++/src/PcapFileDevice.cpp b/Pcap++/src/PcapFileDevice.cpp
index 6d4ab40878..e8cc810672 100644
--- a/Pcap++/src/PcapFileDevice.cpp
+++ b/Pcap++/src/PcapFileDevice.cpp
@@ -874,7 +874,7 @@ namespace pcpp
 			return false;
 		}
 
-		light_packet_header pktHeader;
+		light_packet_header pktHeader{};
 		const uint8_t* pktData = nullptr;
 
 		if (!light_get_next_packet(toLightPcapNgT(m_LightPcapNg), &pktHeader, &pktData))