diff --git a/src/StepShape/StepShape_GeometricSet.cxx b/src/StepShape/StepShape_GeometricSet.cxx
index 24e59cbe77..bd76404127 100644
--- a/src/StepShape/StepShape_GeometricSet.cxx
+++ b/src/StepShape/StepShape_GeometricSet.cxx
@@ -49,5 +49,7 @@ StepShape_GeometricSetSelect StepShape_GeometricSet::ElementsValue(const Standar
 
 Standard_Integer StepShape_GeometricSet::NbElements () const
 {
+	if (elements.IsNull())
+		return 0;
 	return elements->Length();
 }
diff --git a/tests/bugs/step/bug31675 b/tests/bugs/step/bug31675
new file mode 100644
index 0000000000..294564d600
--- /dev/null
+++ b/tests/bugs/step/bug31675
@@ -0,0 +1,16 @@
+puts "===================================="
+puts "0031675: Er-ror opening the STEP-file"
+puts "===================================="
+puts ""
+
+pload DCAF
+
+# Read file
+ReadStep D [locate_data_file bug31675.stp]
+XGetOneShape res D
+
+# Checking 
+checknbshapes res -face 1036 -wire 2103 -compound 6
+checkshape res f
+
+Close D