diff --git a/src/apps/common/apputils.c b/src/apps/common/apputils.c
index dda312e..786781b 100644
--- a/src/apps/common/apputils.c
+++ b/src/apps/common/apputils.c
@@ -919,6 +919,9 @@ static char *_WTA(__in wchar_t *pszInBuf, __in int nInSize, __out char **pszOutB
   // and we have to add space to the allocation ourselves.
   (*pnOutSize)++;
   *pszOutBuf = malloc(*pnOutSize * sizeof(char));
+  if (!pszOutBuf) {
+    return NULL;
+  }
   if (WideCharToMultiByte((UINT)0, (DWORD)0, pszInBuf, nInSize, *pszOutBuf, *pnOutSize, NULL, NULL) == 0) {
     free(*pszOutBuf);
     return NULL;
@@ -1340,10 +1343,12 @@ void build_base64_decoding_table(void) {
 
   char *table = (char *)calloc(256, sizeof(char));
 
-  for (size_t i = 0; i < 64; i++) {
-    table[(unsigned char)encoding_table[i]] = i;
+  if (table) {
+    for (size_t i = 0; i < 64; i++) {
+      table[(unsigned char)encoding_table[i]] = i;
+    }
+    decoding_table = table;
   }
-  decoding_table = table;
 }
 
 unsigned char *base64_decode(const char *data, size_t input_length, size_t *output_length) {
diff --git a/src/apps/relay/ns_ioalib_engine_impl.c b/src/apps/relay/ns_ioalib_engine_impl.c
index 772a3e2..47d96e1 100644
--- a/src/apps/relay/ns_ioalib_engine_impl.c
+++ b/src/apps/relay/ns_ioalib_engine_impl.c
@@ -594,11 +594,13 @@ ioa_timer_handle set_ioa_timer(ioa_engine_handle e, int secs, int ms, ioa_timer_
 
     tv.tv_sec = secs;
 
-    te->ctx = ctx;
-    te->e = e;
-    te->ev = ev;
-    te->cb = cb;
-    te->txt = strdup(txt);
+    if (te) {
+      te->ctx = ctx;
+      te->e = e;
+      te->ev = ev;
+      te->cb = cb;
+      te->txt = strdup(txt);
+    }
 
     if (!ms) {
       tv.tv_usec = 0;
@@ -1364,7 +1366,6 @@ ioa_socket_handle create_ioa_socket_from_fd(ioa_engine_handle e, ioa_socket_raw
   }
 
   ret->magic = SOCKET_MAGIC;
-
   ret->fd = fd;
   ret->st = st;
   ret->sat = sat;
@@ -3661,7 +3662,7 @@ void turn_report_allocation_set(void *a, turn_time_t lifetime, int refresh) {
           }
         }
 #if !defined(TURN_NO_HIREDIS)
-        if (e && ss) {
+        if (e && ss && ss->client_socket) {
           char key[1024];
           if (ss->realm_options.name[0]) {
             snprintf(key, sizeof(key), "turn/realm/%s/user/%s/allocation/%018llu/status", ss->realm_options.name,
diff --git a/src/apps/relay/turn_admin_server.c b/src/apps/relay/turn_admin_server.c
index 8581912..af3b26c 100644
--- a/src/apps/relay/turn_admin_server.c
+++ b/src/apps/relay/turn_admin_server.c
@@ -1178,20 +1178,22 @@ static void cliserver_input_handler(struct evconnlistener *l, evutil_socket_t fd
     return;
   }
 
-  clisession->rp = get_realm(NULL);
+  if (clisession) {
+    clisession->rp = get_realm(NULL);
 
-  set_socket_options_fd(fd, TCP_SOCKET, sa->sa_family);
+    set_socket_options_fd(fd, TCP_SOCKET, sa->sa_family);
 
-  clisession->fd = fd;
+    clisession->fd = fd;
 
-  addr_cpy(&(clisession->addr), (ioa_addr *)sa);
+    addr_cpy(&(clisession->addr), (ioa_addr *)sa);
 
-  clisession->bev = bufferevent_socket_new(adminserver.event_base, fd, TURN_BUFFEREVENTS_OPTIONS);
-  bufferevent_setcb(clisession->bev, cli_socket_input_handler_bev, NULL, cli_eventcb_bev, clisession);
-  bufferevent_setwatermark(clisession->bev, EV_READ | EV_WRITE, 0, BUFFEREVENT_HIGH_WATERMARK);
-  bufferevent_enable(clisession->bev, EV_READ); /* Start reading. */
+    clisession->bev = bufferevent_socket_new(adminserver.event_base, fd, TURN_BUFFEREVENTS_OPTIONS);
+    bufferevent_setcb(clisession->bev, cli_socket_input_handler_bev, NULL, cli_eventcb_bev, clisession);
+    bufferevent_setwatermark(clisession->bev, EV_READ | EV_WRITE, 0, BUFFEREVENT_HIGH_WATERMARK);
+    bufferevent_enable(clisession->bev, EV_READ); /* Start reading. */
 
-  clisession->ts = telnet_init(cli_telopts, cli_telnet_event_handler, 0, clisession);
+    clisession->ts = telnet_init(cli_telopts, cli_telnet_event_handler, 0, clisession);
+  }
 
   if (!(clisession->ts)) {
     const char *str = "Cannot open telnet session\n";
@@ -1449,7 +1451,7 @@ void admin_server_receive_message(struct bufferevent *bev, void *ptr) {
   int n = 0;
   struct evbuffer *input = bufferevent_get_input(bev);
 
-  while ((n = evbuffer_remove(input, tsi, sizeof(struct turn_session_info))) > 0) {
+  while (tsi && (n = evbuffer_remove(input, tsi, sizeof(struct turn_session_info))) > 0) {
     if (n != sizeof(struct turn_session_info)) {
       fprintf(stderr, "%s: Weird CLI buffer error: size=%d\n", __FUNCTION__, n);
       continue;
diff --git a/src/apps/uclient/startuclient.c b/src/apps/uclient/startuclient.c
index 0f1b6d4..f685d0d 100644
--- a/src/apps/uclient/startuclient.c
+++ b/src/apps/uclient/startuclient.c
@@ -289,7 +289,7 @@ start_socket:
     STRCPY(clnet_info->ifname, (const char *)ifname);
   }
 
-  if (use_secure) {
+  if (use_secure && clnet_info) {
     bool try_again = false;
     clnet_info->ssl = tls_connect(clnet_info->fd, &remote_addr, &try_again, connect_cycle++);
     if (!clnet_info->ssl) {
diff --git a/src/apps/uclient/uclient.c b/src/apps/uclient/uclient.c
index e47ef13..dab3d9e 100644
--- a/src/apps/uclient/uclient.c
+++ b/src/apps/uclient/uclient.c
@@ -1489,7 +1489,7 @@ void start_mclient(const char *remote_address, int port, const unsigned char *if
 
     if (is_TCP_relay()) {
       if (passive_tcp) {
-        if (elems[i]->pinfo.is_peer) {
+        if (elems && elems[i]->pinfo.is_peer) {
           int connect_err = 0;
           socket_connect(elems[i]->pinfo.fd, &(elems[i]->pinfo.remote_addr), &connect_err);
         }
diff --git a/src/client/ns_turn_msg.c b/src/client/ns_turn_msg.c
index a204353..8bb2b40 100644
--- a/src/client/ns_turn_msg.c
+++ b/src/client/ns_turn_msg.c
@@ -185,6 +185,10 @@ bool stun_produce_integrity_key_str(const uint8_t *uname, const uint8_t *realm,
     return false;
   }
 
+  if (!str) {
+    return false;
+  }
+
   strncpy((char *)str, (const char *)uname, sz);
   str[ulen] = ':';
   strncpy((char *)str + ulen + 1, (const char *)realm, sz - ulen - 1);
diff --git a/src/server/ns_turn_maps.c b/src/server/ns_turn_maps.c
index 8423499..932169f 100644
--- a/src/server/ns_turn_maps.c
+++ b/src/server/ns_turn_maps.c
@@ -951,13 +951,15 @@ static bool ur_string_map_init(ur_string_map *map) {
 
 ur_string_map *ur_string_map_create(ur_string_map_func del_value_func) {
   ur_string_map *map = (ur_string_map *)malloc(sizeof(ur_string_map));
-  if (!ur_string_map_init(map)) {
+  if (map == NULL) {
+    return NULL;
+  } else if (!ur_string_map_init(map)) {
     free(map);
     return NULL;
+  } else {
+    map->del_value_func = del_value_func;
+    return map;
   }
-  assert(map);
-  map->del_value_func = del_value_func;
-  return map;
 }
 
 bool ur_string_map_put(ur_string_map *map, const ur_string_map_key_type key, ur_string_map_value_type value) {