diff --git a/ext/linkage b/ext/linkage
index 3e2bd99..b13855d 160000
--- a/ext/linkage
+++ b/ext/linkage
@@ -1 +1 @@
-Subproject commit 3e2bd997a6048a0c2d9318e65a63b30a35c67dfa
+Subproject commit b13855d46f848daa43eee990081b97f3e83d87fd
diff --git a/inc/constant.h b/inc/constant.h
index 753b3cf..cdc2eb6 100644
--- a/inc/constant.h
+++ b/inc/constant.h
@@ -447,6 +447,7 @@ constexpr auto kGameMaxPlayers = 32;
 constexpr auto kGameTeamNum = 2;
 constexpr auto kInvalidNodeIndex = -1;
 constexpr auto kGrenadeInventoryEmpty = -1;
+constexpr auto kInvalidRadioSlot = -1;
 constexpr auto kConfigExtension = "cfg";
 
 // weapon masks
diff --git a/inc/graph.h b/inc/graph.h
index 24fa82b..48576f6 100644
--- a/inc/graph.h
+++ b/inc/graph.h
@@ -268,8 +268,8 @@ public:
    const IntArray &getNodesInBucket (const Vector &pos);
 
 public:
-   size_t getMaxRouteLength () const {
-      return m_paths.length () / 2;
+  int32_t getMaxRouteLength () const {
+     return length () / 2;
    }
 
    StringRef getAuthor () const {
diff --git a/inc/yapb.h b/inc/yapb.h
index 7742ad1..23c8b59 100644
--- a/inc/yapb.h
+++ b/inc/yapb.h
@@ -188,7 +188,7 @@ public:
       m_path[0] = 0;
    }
 
-   void init (size_t length) {
+   void init (int32_t length) {
       m_path = cr::makeUnique <int32_t[]> (length);
    }
 };
diff --git a/src/botlib.cpp b/src/botlib.cpp
index f694d93..1f24a96 100644
--- a/src/botlib.cpp
+++ b/src/botlib.cpp
@@ -947,7 +947,7 @@ void Bot::pushChatterMessage (int message) {
    }
 
    if (!sendMessage) {
-      m_radioSelect = -1;
+      m_radioSelect = kInvalidRadioSlot;
       return;
    }
    m_radioSelect = message;
@@ -1047,14 +1047,14 @@ void Bot::checkMsgQueue () {
          // if same message like previous just do a yes/no
          if (m_radioSelect != Radio::RogerThat && m_radioSelect != Radio::Negative) {
             if (m_radioSelect == bots.getLastRadio (m_team) && bots.getLastRadioTimestamp (m_team) + delayResponseTime * 0.5f > game.time ()) {
-               m_radioSelect = -1;
+               m_radioSelect = kInvalidRadioSlot;
             }
             else {
                if (m_radioSelect != Radio::ReportingIn) {
                   bots.setLastRadio (m_team, m_radioSelect);
                }
                else {
-                  bots.setLastRadio (m_team, -1);
+                  bots.setLastRadio (m_team, kInvalidRadioSlot);
                }
 
                for (const auto &bot : bots) {
@@ -1066,26 +1066,28 @@ void Bot::checkMsgQueue () {
             }
          }
 
-         if (m_radioSelect != -1) {
+         if (m_radioSelect != kInvalidRadioSlot) {
             if ((m_radioSelect != Radio::ReportingIn && m_forceRadio)
                || cv_radio_mode.as <int> () != 2
                || !conf.hasChatterBank (m_radioSelect)
                || !game.is (GameFlags::HasBotVoice)) {
 
+               auto radioSlot = m_radioSelect;
+
                if (m_radioSelect < Radio::GoGoGo) {
                   issueCommand ("radio1");
                }
                else if (m_radioSelect < Radio::RogerThat) {
-                  m_radioSelect -= Radio::GoGoGo - 1;
+                  radioSlot -= Radio::GoGoGo - 1;
                   issueCommand ("radio2");
                }
                else {
-                  m_radioSelect -= Radio::RogerThat - 1;
+                  radioSlot -= Radio::RogerThat - 1;
                   issueCommand ("radio3");
                }
 
                // select correct menu item for this radio message
-               issueCommand ("menuselect %d", m_radioSelect);
+               issueCommand ("menuselect %d", radioSlot);
             }
             else if (m_radioSelect != Radio::ReportingIn) {
                instantChatter (m_radioSelect);
diff --git a/src/message.cpp b/src/message.cpp
index 5ca4cfd..c9cf39c 100644
--- a/src/message.cpp
+++ b/src/message.cpp
@@ -227,7 +227,7 @@ void MessageDispatcher::netMsgMoney () {
    if (amount < 0) {
       amount = 800;
    }
-   else if (amount > INT32_MAX) {
+   else if (amount >= INT32_MAX) {
       amount = 16000;
    }
    m_bot->m_moneyAmount = amount;