diff --git a/src/STEPConstruct/STEPConstruct_Styles.cxx b/src/STEPConstruct/STEPConstruct_Styles.cxx
index 4dfe51c818..ad131f96c0 100644
--- a/src/STEPConstruct/STEPConstruct_Styles.cxx
+++ b/src/STEPConstruct/STEPConstruct_Styles.cxx
@@ -575,6 +575,8 @@ Standard_Boolean STEPConstruct_Styles::GetColors (const Handle(StepVisual_Styled
 	  Handle(StepVisual_SurfaceStyleFillArea) SSFA = SSES.SurfaceStyleFillArea();
 	  if ( !SSFA.IsNull() ) {
 	    Handle(StepVisual_FillAreaStyle) FAS = SSFA->FillArea();
+      if (FAS.IsNull())
+        continue;
 	    for ( Standard_Integer m=1; m <= FAS->NbFillStyles(); m++ ) {
 	      StepVisual_FillStyleSelect FSS = FAS->FillStylesValue ( m );
 	      Handle(StepVisual_FillAreaStyleColour) FASC = FSS.FillAreaStyleColour();
diff --git a/src/StepVisual/StepVisual_FillAreaStyle.cxx b/src/StepVisual/StepVisual_FillAreaStyle.cxx
index fea1068635..43d5391301 100644
--- a/src/StepVisual/StepVisual_FillAreaStyle.cxx
+++ b/src/StepVisual/StepVisual_FillAreaStyle.cxx
@@ -56,5 +56,5 @@ StepVisual_FillStyleSelect StepVisual_FillAreaStyle::FillStylesValue(const Stand
 
 Standard_Integer StepVisual_FillAreaStyle::NbFillStyles () const
 {
-	return fillStyles->Length();
+  return (fillStyles.IsNull() ? 0 : fillStyles->Length());
 }