diff --git a/.gitattributes b/.gitattributes
index ce67de85a2..e796dc7cab 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -10974,6 +10974,7 @@ tests/webtbf/tw1842.pp svneol=native#text/plain
 tests/webtbf/tw1858.pp svneol=native#text/plain
 tests/webtbf/tw18620.pp svneol=native#text/pascal
 tests/webtbf/tw1905.pp svneol=native#text/plain
+tests/webtbf/tw19213.pp svneol=native#text/plain
 tests/webtbf/tw1927.pp svneol=native#text/plain
 tests/webtbf/tw1928.pp svneol=native#text/plain
 tests/webtbf/tw1939.pp svneol=native#text/plain
diff --git a/compiler/pdecsub.pas b/compiler/pdecsub.pas
index 26549dbef0..e32f8c8b94 100644
--- a/compiler/pdecsub.pas
+++ b/compiler/pdecsub.pas
@@ -1467,7 +1467,10 @@ implementation
                                break;
                              end;
                          if not found then
-                           Message1(parser_e_at_least_one_argument_must_be_of_type,pd.struct.RttiName);
+                           if assigned(pd.struct) then
+                             Message1(parser_e_at_least_one_argument_must_be_of_type,pd.struct.RttiName)
+                           else
+                             MessagePos(pd.fileinfo,type_e_type_id_expected);
                        end;
                      if (optoken in [_EQ,_NE,_GT,_LT,_GTE,_LTE,_OP_IN]) and
                         ((pd.returndef.typ<>orddef) or
diff --git a/tests/webtbf/tw19213.pp b/tests/webtbf/tw19213.pp
new file mode 100644
index 0000000000..4a6872eacd
--- /dev/null
+++ b/tests/webtbf/tw19213.pp
@@ -0,0 +1,16 @@
+{ %fail }
+
+unit tw19213;
+
+{$mode objfpc}
+
+interface
+
+implementation
+
+class operator + (a, b: String): Integer;
+begin
+  Result := Length(a) + Length(b);
+end;
+
+end.