diff --git a/src/common/network/json/json.h b/src/common/network/json/json.h
index 177f2bba..7a9a2f64 100644
--- a/src/common/network/json/json.h
+++ b/src/common/network/json/json.h
@@ -17,6 +17,7 @@
 #define __JSON_H__
 
 #include "common/Defines.h"
+#include "common/Log.h"
 
 #include <algorithm>
 #include <cstdio>
@@ -171,6 +172,8 @@ namespace json
 
         template <typename T> const T &get() const;
         template <typename T> T &get();
+        template <typename T> const T getDefault(T def) const;
+        template <typename T> T getDefault(T def);
 
         template <typename T> void set(const T &);
 #if PICOJSON_USE_RVALUE_REFERENCE
@@ -376,12 +379,22 @@ namespace json
 
     #define GET(ctype, var)                                                         \
         template <> inline const ctype &value::get<ctype>() const {                 \
+            if (!is<ctype>()) ::LogError(LOG_HOST, "JSON ERROR: type mismatch! call is<type>() before get<type>(), type = %s, %s", to_type().c_str(), to_str().c_str()); \
             PICOJSON_ASSERT("type mismatch! call is<type>() before get<type>()" && is<ctype>()); \
             return var;                                                             \
         }                                                                           \
         template <> inline ctype &value::get<ctype>() {                             \
+            if (!is<ctype>()) ::LogError(LOG_HOST, "JSON ERROR: type mismatch! call is<type>() before get<type>(), type = %s, %s", to_type().c_str(), to_str().c_str()); \
             PICOJSON_ASSERT("type mismatch! call is<type>() before get<type>()" && is<ctype>()); \
             return var;                                                             \
+        }                                                                           \
+        template <> inline const ctype value::getDefault<ctype>(ctype def) const {  \
+            if (!is<ctype>()) return def;                                           \
+            return var;                                                             \
+        }                                                                           \
+        template <> inline ctype value::getDefault<ctype>(ctype def) {              \
+            if (!is<ctype>()) return def;                                           \
+            return var;                                                             \
         }
 
     GET(bool, u_.boolean_)
diff --git a/src/sysview/AffListWnd.h b/src/sysview/AffListWnd.h
index 08c9b6c3..ad5ca1ff 100644
--- a/src/sysview/AffListWnd.h
+++ b/src/sysview/AffListWnd.h
@@ -111,12 +111,12 @@ public:
                 json::array fneAffils = rsp["affiliations"].get<json::array>();
                 for (auto entry : fneAffils) {
                     json::object peerAffils = entry.get<json::object>();
-                    uint32_t peerId = peerAffils["peerId"].get<uint32_t>();
+                    uint32_t peerId = peerAffils["peerId"].getDefault<uint32_t>(0U);
                     json::array affils = peerAffils["affiliations"].get<json::array>();
                     for (auto pentry : affils) {
                         json::object peerEntry = pentry.get<json::object>();
-                        uint32_t dstId = peerEntry["dstId"].get<uint32_t>();
-                        uint32_t srcId = peerEntry["srcId"].get<uint32_t>();
+                        uint32_t dstId = peerEntry["dstId"].getDefault<uint32_t>(0U);
+                        uint32_t srcId = peerEntry["srcId"].getDefault<uint32_t>(0U);
 
                         // pad peer IDs properly
                         std::ostringstream peerOss;
diff --git a/src/sysview/PeerListWnd.h b/src/sysview/PeerListWnd.h
index 2dececd6..68b96577 100644
--- a/src/sysview/PeerListWnd.h
+++ b/src/sysview/PeerListWnd.h
@@ -111,11 +111,11 @@ public:
                 json::array fnePeers = rsp["peers"].get<json::array>();
                 for (auto entry : fnePeers) {
                     json::object peerObj = entry.get<json::object>();
-                    uint32_t peerId = peerObj["peerId"].get<uint32_t>();
-                    std::string peerAddress = peerObj["address"].get<std::string>();
-                    uint16_t port = (uint16_t)peerObj["port"].get<uint32_t>();
-                    bool connected = peerObj["connected"].get<bool>();
-                    uint32_t connectionState = (uint32_t)peerObj["connectionState"].get<uint32_t>();
+                    uint32_t peerId = peerObj["peerId"].getDefault<uint32_t>(0U);
+                    std::string peerAddress = peerObj["address"].getDefault<std::string>("");
+                    uint16_t port = (uint16_t)peerObj["port"].getDefault<uint32_t>(0U);
+                    bool connected = peerObj["connected"].getDefault<bool>(false);
+                    uint32_t connectionState = (uint32_t)peerObj["connectionState"].getDefault<uint32_t>(0U);
                     std::string strConnState = "";
                     switch (connectionState) {
                     case network::NET_CONN_STATUS::NET_STAT_RUNNING:
@@ -135,25 +135,25 @@ public:
                         break;
                     }
 
-                    uint32_t pingsReceived = (uint32_t)peerObj["pingsReceived"].get<uint32_t>();
-                    uint64_t lastPing = (uint64_t)peerObj["lastPing"].get<uint32_t>();
+                    uint32_t pingsReceived = (uint32_t)peerObj["pingsReceived"].getDefault<uint32_t>(0U);
+                    uint64_t lastPing = (uint64_t)peerObj["lastPing"].getDefault<uint32_t>(0U);
 
-                    uint32_t ccPeerId = (uint32_t)peerObj["controlChannel"].get<uint32_t>();
+                    uint32_t ccPeerId = (uint32_t)peerObj["controlChannel"].getDefault<uint32_t>(0U);
 
                     json::array voiceChannels = peerObj["voiceChannels"].get<json::array>();
                     std::vector<uint32_t> voiceChannelPeers;
                     for (auto vcEntry : voiceChannels) {
-                        uint32_t vcPeerId = vcEntry.get<uint32_t>();
+                        uint32_t vcPeerId = vcEntry.getDefault<uint32_t>(0U);
                         voiceChannelPeers.push_back(vcPeerId);
                     }
 
                     json::object peerConfig = peerObj["config"].get<json::object>();
-                    std::string identity = peerConfig["identity"].get<std::string>();
-                    std::string software = peerConfig["software"].get<std::string>();
+                    std::string identity = peerConfig["identity"].getDefault<std::string>("");
+                    std::string software = peerConfig["software"].getDefault<std::string>("");
 
                     json::object channel = peerConfig["channel"].get<json::object>();
-                    uint32_t chNo = (uint32_t)channel["channelNo"].get<int>();
-                    uint8_t chId = channel["channelId"].get<uint8_t>();
+                    uint32_t chNo = (uint32_t)channel["channelNo"].getDefault<int>(1);
+                    uint8_t chId = channel["channelId"].getDefault<uint8_t>(0U);
 
                     g_peerIdentityNameMap[peerId] = std::string(identity);