diff --git a/core/HalfLife2.cpp b/core/HalfLife2.cpp
index a9feccff..a2e97991 100644
--- a/core/HalfLife2.cpp
+++ b/core/HalfLife2.cpp
@@ -337,8 +337,13 @@ bool UTIL_FindInSendTable(SendTable *pTable,
 	return false;
 }
 
-typedescription_t *UTIL_FindInDataMap(datamap_t *pMap, const char *name)
+typedescription_t *UTIL_FindInDataMap(datamap_t *pMap, const char *name, bool *isNested)
 {
+	if (isNested)
+	{
+		*isNested = false;
+	}
+	
 	while (pMap)
 	{
 		for (int i=0; i<pMap->dataNumFields; i++)
@@ -353,10 +358,21 @@ typedescription_t *UTIL_FindInDataMap(datamap_t *pMap, const char *name)
 			}
 			if (pMap->dataDesc[i].td)
 			{
-				typedescription_t *_td;
-				if ((_td=UTIL_FindInDataMap(pMap->dataDesc[i].td, name)) != NULL)
+				if (isNested)
 				{
-					return _td;
+					*isNested = (UTIL_FindInDataMap(pMap->dataDesc[i].td, name, NULL) != NULL);
+					if (*isNested)
+					{
+						return NULL;
+					} else {
+						continue;
+					}
+				} else { // Use the old behaviour, we dont want to spring this on extensions - even if they're doing bad things.
+					typedescription_t *_td;
+					if ((_td=UTIL_FindInDataMap(pMap->dataDesc[i].td, name, NULL)) != NULL)
+					{
+						return _td;
+					}
 				}
 			}
 		}
@@ -449,6 +465,11 @@ SendProp *CHalfLife2::FindInSendTable(const char *classname, const char *offset)
 }
 
 typedescription_t *CHalfLife2::FindInDataMap(datamap_t *pMap, const char *offset)
+{
+	return this->FindInDataMap(pMap, offset, NULL);
+}
+
+typedescription_t *CHalfLife2::FindInDataMap(datamap_t *pMap, const char *offset, bool *isNested)
 {
 	typedescription_t *td = NULL;
 	DataMapTrie &val = m_Maps[pMap];
@@ -459,7 +480,7 @@ typedescription_t *CHalfLife2::FindInDataMap(datamap_t *pMap, const char *offset
 	}
 	if (!sm_trie_retrieve(val.trie, offset, (void **)&td))
 	{
-		if ((td = UTIL_FindInDataMap(pMap, offset)) != NULL)
+		if ((td = UTIL_FindInDataMap(pMap, offset, isNested)) != NULL)
 		{
 			sm_trie_insert(val.trie, offset, td);
 		}
diff --git a/core/HalfLife2.h b/core/HalfLife2.h
index 047affd8..33792dc0 100644
--- a/core/HalfLife2.h
+++ b/core/HalfLife2.h
@@ -123,6 +123,7 @@ public: //IGameHelpers
 	datamap_t *GetDataMap(CBaseEntity *pEntity);
 	ServerClass *FindServerClass(const char *classname);
 	typedescription_t *FindInDataMap(datamap_t *pMap, const char *offset);
+	typedescription_t *FindInDataMap(datamap_t *pMap, const char *offset, bool *isNested);
 	void SetEdictStateChanged(edict_t *pEdict, unsigned short offset);
 	bool TextMsg(int client, int dest, const char *msg);
 	bool HintTextMsg(int client, const char *msg);
diff --git a/core/smn_entities.cpp b/core/smn_entities.cpp
index 02a4c219..8870ac58 100644
--- a/core/smn_entities.cpp
+++ b/core/smn_entities.cpp
@@ -815,9 +815,13 @@ static cell_t FindDataMapOffs(IPluginContext *pContext, const cell_t *params)
 	}
 
 	pContext->LocalToString(params[2], &offset);
-	if ((td=g_HL2.FindInDataMap(pMap, offset)) == NULL)
+	bool isNested = false;
+	if ((td=g_HL2.FindInDataMap(pMap, offset, &isNested)) == NULL)
 	{
-		return -1;
+		if (isNested)
+			return pContext->ThrowNativeError("Property \"%s\" is not safe to access for entity %d", offset, params[1]);
+		else
+			return -1;
 	}
 
 	if (params[0] == 4)
@@ -962,13 +966,22 @@ static cell_t SetEntDataString(IPluginContext *pContext, const cell_t *params)
 	{ \
 		return pContext->ThrowNativeError("Could not retrieve datamap"); \
 	} \
-	if ((td = g_HL2.FindInDataMap(pMap, prop)) == NULL) \
+	bool isNested = false; \
+	if ((td = g_HL2.FindInDataMap(pMap, prop, &isNested)) == NULL) \
 	{ \
 		const char *class_name = g_HL2.GetEntityClassname(pEntity); \
-		return pContext->ThrowNativeError("Property \"%s\" not found (entity %d/%s)", \
-			prop, \
-			params[1], \
-			((class_name) ? class_name : "")); \
+		if (isNested) \
+		{ \
+			return pContext->ThrowNativeError("Property \"%s\" not safe to access (entity %d/%s)", \
+				prop, \
+				params[1], \
+				((class_name) ? class_name : "")); \
+		} else { \
+			return pContext->ThrowNativeError("Property \"%s\" not found (entity %d/%s)", \
+				prop, \
+				params[1], \
+				((class_name) ? class_name : "")); \
+		} \
 	}
 
 #define CHECK_SET_PROP_DATA_OFFSET() \
@@ -1889,9 +1902,13 @@ static cell_t SetEntPropString(IPluginContext *pContext, const cell_t *params)
 				return pContext->ThrowNativeError("Unable to retrieve GetDataDescMap offset");
 			}
 			pContext->LocalToString(params[3], &prop);
-			if ((td=g_HL2.FindInDataMap(pMap, prop)) == NULL)
+			bool isNested = false;
+			if ((td=g_HL2.FindInDataMap(pMap, prop, &isNested)) == NULL)
 			{
-				return pContext->ThrowNativeError("Property \"%s\" not found for entity %d", prop, params[1]);
+				if (isNested)
+					return pContext->ThrowNativeError("Property \"%s\" is not safe to access for entity %d", prop, params[1]);
+				else
+					return pContext->ThrowNativeError("Property \"%s\" not found for entity %d", prop, params[1]);
 			}
 			if (td->fieldType != FIELD_CHARACTER)
 			{