diff --git a/src/ChFi3d/ChFi3d_Builder_C1.cxx b/src/ChFi3d/ChFi3d_Builder_C1.cxx
index 1996ca9d19..da727d1a35 100644
--- a/src/ChFi3d/ChFi3d_Builder_C1.cxx
+++ b/src/ChFi3d/ChFi3d_Builder_C1.cxx
@@ -1645,6 +1645,13 @@ void ChFi3d_Builder::PerformIntersectionAtEnd(const Standard_Integer Index)
       }
       if (compoint1 && compoint2) {
 	SeqFil.Remove(num);
+	num = ChFi3d_IndexOfSurfData(Vtx,stripe,sens);
+	if (isfirst) {
+	  num1=num+1;
+	}
+	else {
+	  num1=num-1;
+	}
         reg1=Standard_False; reg2=Standard_False;
       }
     }
diff --git a/tests/bugs/modalg_8/bug32929 b/tests/bugs/modalg_8/bug32929
new file mode 100644
index 0000000000..cb82a99889
--- /dev/null
+++ b/tests/bugs/modalg_8/bug32929
@@ -0,0 +1,44 @@
+puts "============"
+puts "OCC32929: Modeling Algorithms - Crash in PerformIntersectionAtEnd after deletion of surfdata (fillet)"
+puts "============"
+puts ""
+
+# Load & prepare data.
+restore [locate_data_file bug32929.brep] b
+explode b E
+
+# Make screenshot before filleting.
+smallview
+donly b b_8
+fit
+xwd $imagedir/${test_image}_1.png
+
+# Make fillet.
+blend result b 1 b_8
+
+# Make screenshot after filleting.
+donly result
+fit
+xwd $imagedir/${test_image}_2.png
+
+# Check mass.
+checkprops result -s 13435.4
+
+# Check validity of result.
+checkshape result
+
+# Check content.
+set nbshapes_expected "
+Number of shapes in shape
+ VERTEX    : 25
+ EDGE      : 40
+ WIRE      : 17
+ FACE      : 17
+ SHELL     : 1
+ SOLID     : 1
+ COMPSOLID : 0
+ COMPOUND  : 1
+ SHAPE     : 102
+"
+
+checknbshapes result -ref ${nbshapes_expected} -t -m "Result of ChFi3d_ChBuilder algorithm"