Scripts/Commands: Fix crash caused by .set npc model (#22877)

* Scripts/Commands: Fix crash caused by .set npc model

Fix crash caused by .set npc model with invalid model id

(cherry picked from commit 20ea24bf5ccf165ce19139d1f7ec7c650719eb68)

3 files changed, 9 insertions, 2 deletions

diff --git a/src/server/game/Miscellaneous/Language.h b/src/server/game/Miscellaneous/Language.h
index 4db3b72c31d..1ee3866c201 100644
--- a/src/server/game/Miscellaneous/Language.h
+++ b/src/server/game/Miscellaneous/Language.h
@@ -362,7 +362,7 @@ enum TrinityStrings
     LANG_COMMAND_MODIFY_ARENA             = 306,
     LANG_COMMAND_FACTION_NOTFOUND         = 307,
     LANG_COMMAND_FACTION_UNKNOWN          = 308,
-    LANG_COMMAND_FACTION_INVPARAM         = 309,
+    LANG_COMMAND_INVALID_PARAM            = 309,
     LANG_COMMAND_FACTION_DELTA            = 310,
     LANG_FACTION_LIST                     = 311,
     LANG_FACTION_VISIBLE                  = 312,
diff --git a/src/server/scripts/Commands/cs_modify.cpp b/src/server/scripts/Commands/cs_modify.cpp
index a0eaa8aea32..804d6736455 100644
--- a/src/server/scripts/Commands/cs_modify.cpp
+++ b/src/server/scripts/Commands/cs_modify.cpp
@@ -734,7 +734,7 @@ public:
 
             if (rankThresholdItr == end)
             {
-                handler->PSendSysMessage(LANG_COMMAND_FACTION_INVPARAM, rankTxt);
+                handler->PSendSysMessage(LANG_COMMAND_INVALID_PARAM, rankTxt);
                 handler->SetSentErrorMessage(true);
                 return false;
             }
diff --git a/src/server/scripts/Commands/cs_npc.cpp b/src/server/scripts/Commands/cs_npc.cpp
index a2e77968346..0c82ee14b7f 100644
--- a/src/server/scripts/Commands/cs_npc.cpp
+++ b/src/server/scripts/Commands/cs_npc.cpp
@@ -879,6 +879,13 @@ public:
             return false;
         }
 
+        if (!sCreatureDisplayInfoStore.LookupEntry(displayId))
+        {
+            handler->PSendSysMessage(LANG_COMMAND_INVALID_PARAM, args);
+            handler->SetSentErrorMessage(true);
+            return false;
+        }
+
         creature->SetDisplayId(displayId);
         creature->SetNativeDisplayId(displayId);