diff --git a/src/ITAGeo/Base.cpp b/src/ITAGeo/Base.cpp
index 84f12b8a6ceae88398e2513a4f2c9e993e5ec7ed..5e927a70f5106b1bf371512aa0c4ee2043618e06 100644
--- a/src/ITAGeo/Base.cpp
+++ b/src/ITAGeo/Base.cpp
@@ -411,10 +411,12 @@ void ITAGeo::CMirrorImage::LoadFromJSONString( const std::string& sContent, std:
 	v3MirrorNormal.SetValues( dMirrorNormal );
 
 	//Get and set the polygon index
-	iPolygonIndex = ( int ) jnRoot.at( "polygon_index" ).as_int();
+	if( jnRoot.find( "polygon_index" ) != jnRoot.end() )
+		iPolygonIndex = ( int ) jnRoot.at( "polygon_index" ).as_int();
 
 	//Get and set the order number
-	iOrder = ( int ) jnRoot.at( "order" ).as_int();
+	if( jnRoot.find( "order" ) != jnRoot.end() )
+		iOrder = ( int ) jnRoot.at( "order" ).as_int();
 
 #endif
 }
@@ -504,7 +506,8 @@ void ITAGeo::CSpecularReflection::LoadFromJSONString( const std::string& sConten
 
 	CPropagationAnchor::LoadFromJSONString( sContent, pResourceManager );
 
-	iPolygonID = jnRoot.at( "polygon_id" ).as_int();
+	if( jnRoot.find("polygon_id") != jnRoot.end() )
+		iPolygonID = jnRoot.at( "polygon_id" ).as_int();
 
 #endif
 }
@@ -810,8 +813,10 @@ void ITAGeo::CITADiffractionWedgeApertureBase::LoadFromJSONString( const std::st
 	//Set the opposite wedge face normal
 	v3OppositeWedgeFaceNormal.SetValues( dX, dY, dZ, dW );
 
-	int iMainWedgeFaceID = jnRoot.at( "main_wedge_face_id" ).as_int();
-	int iOppositeWedgeFaceID = jnRoot.at( "opposite_wedge_face_id" ).as_int();
+	if( jnRoot.find("main_wedge_face_id") != jnRoot.end() )
+		iMainWedgeFaceID = jnRoot.at( "main_wedge_face_id" ).as_int();
+	if( jnRoot.find( "opposite_wedge_face_id" ) != jnRoot.end() )
+		iOppositeWedgeFaceID = jnRoot.at( "opposite_wedge_face_id" ).as_int();
 
 #endif
 }