diff --git a/src/StepToTopoDS/StepToTopoDS_TranslateVertex.cxx b/src/StepToTopoDS/StepToTopoDS_TranslateVertex.cxx
index a6086563bd..9d7cf98c61 100644
--- a/src/StepToTopoDS/StepToTopoDS_TranslateVertex.cxx
+++ b/src/StepToTopoDS/StepToTopoDS_TranslateVertex.cxx
@@ -65,6 +65,11 @@ void StepToTopoDS_TranslateVertex::Init(const Handle(StepShape_Vertex)& aVertex,
 				                                StepToTopoDS_Tool& aTool,
                                         StepToTopoDS_NMTool& NMTool)
 {
+  if (aVertex.IsNull()) {
+    myError = StepToTopoDS_TranslateVertexOther;
+    done = Standard_False;
+    return;
+  }
   if (!aTool.IsBound(aVertex)) {
 
     // [BEGIN] Proceed with non-manifold topology (ssv; 14.11.2010)
diff --git a/tests/bugs/step/bug26451 b/tests/bugs/step/bug26451
index 1abbed6d9e..3d33b9649d 100644
--- a/tests/bugs/step/bug26451
+++ b/tests/bugs/step/bug26451
@@ -9,20 +9,20 @@ puts ""
 stepread [locate_data_file bug26451_Test_STEP.stp] a *
 tpcompound result
 
-checkprops result -s 550061 
+checkprops result -s 551394 
 checkshape result
 
 set nbshapes_expected "
 Number of shapes in shape
- VERTEX    : 7973
- EDGE      : 8250
- WIRE      : 1950
- FACE      : 1716
- SHELL     : 1716
+ VERTEX    : 8057
+ EDGE      : 8372
+ WIRE      : 1988
+ FACE      : 1754
+ SHELL     : 1754
  SOLID     : 0
  COMPSOLID : 0
  COMPOUND  : 1
- SHAPE     : 21606
+ SHAPE     : 21926
 "
 checknbshapes result -ref ${nbshapes_expected} -t -m "importing file"
 checkview -display result -3d -path ${imagedir}/${test_image}.png
diff --git a/tests/bugs/step/bug28256 b/tests/bugs/step/bug28256
new file mode 100644
index 0000000000..da63f8e664
--- /dev/null
+++ b/tests/bugs/step/bug28256
@@ -0,0 +1,27 @@
+puts "========"
+puts "OCC28256"
+puts "========"
+puts ""
+##########################################################################
+# Opening specific STEP file leads to application crash
+##########################################################################
+
+stepread [locate_data_file bug28256_test.stp] a *
+tpcompound result
+
+checkprops result -s 1.8e+101 
+
+set nbshapes_expected "
+Number of shapes in shape
+ VERTEX    : 56881
+ EDGE      : 85310
+ WIRE      : 37795
+ FACE      : 32992
+ SHELL     : 1318
+ SOLID     : 1308
+ COMPSOLID : 0
+ COMPOUND  : 1
+ SHAPE     : 215605
+"
+checknbshapes result -ref ${nbshapes_expected} -t -m "importing file"
+checkview -display result -3d -path ${imagedir}/${test_image}.png
\ No newline at end of file