diff --git a/TestSuite/errors/err0299.pas b/TestSuite/errors/err0299.pas
new file mode 100644
index 000000000..8e9e520d0
--- /dev/null
+++ b/TestSuite/errors/err0299.pas
@@ -0,0 +1,10 @@
+type
+  t1=class
+    static function operator=(a,b: t1): word := 5;
+  end;
+
+begin
+  var a := new t1;
+  var b := new t1;
+  var c := a=b;//Ошибка: Несколько подпрограмм могут быть вызваны
+end.
\ No newline at end of file
diff --git a/TreeConverter/TreeRealization/type_table.cs b/TreeConverter/TreeRealization/type_table.cs
index ced305d0a..c951216e9 100644
--- a/TreeConverter/TreeRealization/type_table.cs
+++ b/TreeConverter/TreeRealization/type_table.cs
@@ -603,6 +603,10 @@ namespace PascalABCCompiler.TreeRealization
             {
                 return type_compare.non_comparable_type;
             }
+            if (tins.Length == 1 && tins[0].this_to_another != null && tins[0].this_to_another.is_explicit) // SSM bug fix #1441
+            {
+                return type_compare.non_comparable_type;
+            }
             if (tins.Length == 1)
             {
                 return tins[0].type_compare;