diff --git a/common/src/tfe_packet_io.cpp b/common/src/tfe_packet_io.cpp
index 7ecb2e9..6d989b1 100644
--- a/common/src/tfe_packet_io.cpp
+++ b/common/src/tfe_packet_io.cpp
@@ -922,7 +922,6 @@ static void send_event_log(struct session_ctx *s_ctx, int thread_seq, void *ctx)
     // finish writing
     if (mpack_writer_destroy(&writer) != mpack_ok)
     {
-        assert(0);
         if (data)
         {
             free(data);
@@ -935,6 +934,13 @@ static void send_event_log(struct session_ctx *s_ctx, int thread_seq, void *ctx)
     int raw_packet_header_len = s_ctx->ctrl_meta->l7offset;
     marsio_buff_malloc_global(packet_io->instance, tx_buffs, 1, 0, thread_seq);
     char *dst = marsio_buff_append(tx_buffs[0], raw_packet_header_len + size);
+    if (dst == NULL)
+    {
+        TFE_LOG_ERROR(logger, "%s: unable to send log_update packet, get marsio buff is NULL.", LOG_TAG_PKTIO);
+        if (data)
+            free(data);
+        return;
+    }
     memcpy(dst, raw_packet_header_data, raw_packet_header_len);
     memcpy(dst + raw_packet_header_len, data, size);
 
@@ -1037,6 +1043,11 @@ static void packet_io_send_fake_pkt(struct packet_io_thread_ctx *thread, struct
     {
         meta.raw_len = fn[i](info, client_mac, server_mac, buffer, sizeof(buffer));
         meta.raw_data = marsio_buff_append(tx_buffs[i], meta.raw_len);
+        if (meta.raw_data == NULL)
+        {
+            TFE_LOG_ERROR(logger, "%s: unable to send fake packet, get marsio buff is NULL.", LOG_TAG_PKTIO);
+            continue;
+        }
         memcpy(meta.raw_data, buffer, meta.raw_len);
 
         switch (i)
@@ -1914,6 +1925,12 @@ void handle_decryption_packet_from_tap(const char *data, int len, void *args)
 	}
 
     char *dst = marsio_buff_append(tx_buffs[0], len);
+    if (dst == NULL)
+    {
+        throughput_metrics_inc(&packet_io_fs->decrypt_rxdrop, 1, len);
+        TFE_LOG_ERROR(logger, "%s: unable to send decryption packet, get marsio buff is NULL.", LOG_TAG_PKTIO);
+        return;
+    }
     memcpy(dst, data, len);
 
     struct metadata meta = {0};
@@ -2009,12 +2026,24 @@ void handle_raw_packet_from_tap(const char *data, int len, void *args)
     if (header != NULL) {
         packet_len = len + header_len - sizeof(struct ethhdr);
         dst = marsio_buff_append(tx_buffs[0], packet_len);
+        if (dst == NULL)
+        {
+            throughput_metrics_inc(&packet_io_fs->tap_pkt_rxdrop, 1, len);
+            TFE_LOG_ERROR(logger, "%s: unable to send raw packet, get marsio buff is NULL.", LOG_TAG_PKTIO);
+            return;
+        }
         memcpy(dst, header, header_len);
         memcpy(dst + header_len, data + sizeof(struct ethhdr), len - sizeof(struct ethhdr));
     }
     else {
         packet_len = len;
         dst = marsio_buff_append(tx_buffs[0], len);
+        if (dst == NULL)
+        {
+            throughput_metrics_inc(&packet_io_fs->tap_pkt_rxdrop, 1, len);
+            TFE_LOG_ERROR(logger, "%s: unable to send raw packet, get marsio buff is NULL.", LOG_TAG_PKTIO);
+            return;
+        }
         memcpy(dst, data, len);
     }