diff --git a/src/ui/CScriptObject.cpp b/src/ui/CScriptObject.cpp
index 7c5b699..a30cee0 100644
--- a/src/ui/CScriptObject.cpp
+++ b/src/ui/CScriptObject.cpp
@@ -27,11 +27,11 @@ CScriptObject* CScriptObject::GetScriptObjectByName(const char* name, int32_t ty
         if (v4 && v4->IsA(type)) {
             return v4;
         } else {
-            return NULL;
+            return nullptr;
         }
     } else {
         lua_settop(L, -2);
-        return NULL;
+        return nullptr;
     }
 }
 
diff --git a/src/ui/CScriptRegion.hpp b/src/ui/CScriptRegion.hpp
index 6c34039..fc68977 100644
--- a/src/ui/CScriptRegion.hpp
+++ b/src/ui/CScriptRegion.hpp
@@ -21,7 +21,7 @@ class CScriptRegion : public CScriptObject, public CLayoutFrame {
         static int32_t GetObjectType();
 
         // Member variables
-        CSimpleFrame* m_parent = NULL; // TODO verify type
+        CSimpleFrame* m_parent = nullptr; // TODO verify type
 
         // Virtual member functions
         virtual bool IsA(int32_t type);
diff --git a/src/ui/CSimpleFrame.cpp b/src/ui/CSimpleFrame.cpp
index 05199ed..97a3f03 100644
--- a/src/ui/CSimpleFrame.cpp
+++ b/src/ui/CSimpleFrame.cpp
@@ -95,7 +95,7 @@ void CSimpleFrame::LoadXML(XMLNode* node, CStatus* status) {
 
     if (inherits && *inherits) {
         do {
-            SStrTokenize(v68, inheritName, 0x400u, " ,", NULL);
+            SStrTokenize(v68, inheritName, 0x400u, " ,", nullptr);
 
             if (!*inheritName) {
                 break;
@@ -626,7 +626,7 @@ FrameScript_Object::ScriptIx* CSimpleFrame::GetScriptByName(const char* name, Fr
         return &this->m_onDisable;
     }
 
-    return NULL;
+    return nullptr;
 }
 
 int32_t CSimpleFrame::GetScriptMetaTable() {
@@ -799,7 +799,7 @@ void CSimpleFrame::LoadXML_Scripts(XMLNode* root, CStatus* status) {
                     scriptFunction = new (scriptFunction) ScriptFunction();
                     static_cast<ScriptFunction*>(scriptFunction)->luaRef = luaRef;
                 } else {
-                    scriptFunction = NULL;
+                    scriptFunction = nullptr;
                 }
 
                 node->m_userData = scriptFunction;
@@ -840,7 +840,7 @@ void CSimpleFrame::LoadXML_Scripts(XMLNode* root, CStatus* status) {
                 script->luaRef = 0;
             }
 
-            script->unk = NULL;
+            script->unk = nullptr;
 
             if (!SStrCmpI(node->GetName(), "OnChar", 0x7FFFFFFFu) && !(this->m_eventmask & 1)) {
                 if (this->m_visible) {
diff --git a/src/ui/CSimpleFrame.hpp b/src/ui/CSimpleFrame.hpp
index 597b1f2..02eb4ab 100644
--- a/src/ui/CSimpleFrame.hpp
+++ b/src/ui/CSimpleFrame.hpp
@@ -28,8 +28,8 @@ class CSimpleFrame : public CScriptRegion {
         static void RegisterScriptMethods(lua_State* L);
 
         // Member variables
-        CSimpleTop* m_top = NULL;
-        CSimpleTitleRegion* m_titleRegion = NULL;
+        CSimpleTop* m_top = nullptr;
+        CSimpleTitleRegion* m_titleRegion = nullptr;
         int32_t m_intAC = 1;
         int32_t m_id = 0;
         uint32_t m_flags = 0;
diff --git a/src/ui/FrameScript.cpp b/src/ui/FrameScript.cpp
index e5cbb09..0a753d5 100644
--- a/src/ui/FrameScript.cpp
+++ b/src/ui/FrameScript.cpp
@@ -407,7 +407,7 @@ int32_t FrameScript_ExecuteFile(const char* filePath, const char* a2, MD5_CTX* m
     void* fileBuffer;
     size_t fileBytes;
 
-    if (SFile::Load(0, v4, &fileBuffer, &fileBytes, 0, 1, NULL)) {
+    if (SFile::Load(0, v4, &fileBuffer, &fileBytes, 0, 1, nullptr)) {
         if (md5) {
             MD5Update(md5, static_cast<unsigned char*>(fileBuffer), fileBytes);
         }
diff --git a/src/ui/LoadXML.cpp b/src/ui/LoadXML.cpp
index a8f4f37..34d0cd4 100644
--- a/src/ui/LoadXML.cpp
+++ b/src/ui/LoadXML.cpp
@@ -254,7 +254,7 @@ CSimpleFontString* LoadXML_String(XMLNode* node, CSimpleFrame* frame, CStatus* s
     if (m) {
         fontString = new (m) CSimpleFontString(frame, 2, 1);
     } else {
-        fontString = NULL;
+        fontString = nullptr;
     }
 
     fontString->PreLoadXML(node, status);
@@ -275,7 +275,7 @@ CSimpleTexture* LoadXML_Texture(XMLNode* node, CSimpleFrame* frame, CStatus* sta
     if (m) {
         texture = new (m) CSimpleTexture(frame, 2, 1);
     } else {
-        texture = NULL;
+        texture = nullptr;
     }
 
     texture->PreLoadXML(node, status);
diff --git a/src/ui/LuaExtraFuncs.cpp b/src/ui/LuaExtraFuncs.cpp
index fb476a2..92dce82 100644
--- a/src/ui/LuaExtraFuncs.cpp
+++ b/src/ui/LuaExtraFuncs.cpp
@@ -36,7 +36,7 @@ luaL_Reg FrameScriptInternal::extra_funcs[31] = {
     { "debugstack", &debugstack },
     { "debuglocals", &debuglocals },
     { "scrub", &scrub },
-    { NULL, NULL }
+    { nullptr, nullptr }
 };
 
 int32_t sub_8168D0(lua_State* L) {