diff --git a/packages/fcl-passrc/tests/tcresolver.pas b/packages/fcl-passrc/tests/tcresolver.pas
index 98f9fead36..ca5bcf88ae 100644
--- a/packages/fcl-passrc/tests/tcresolver.pas
+++ b/packages/fcl-passrc/tests/tcresolver.pas
@@ -930,6 +930,7 @@ type
     Procedure TestTypeHelper_Enumerator;
     Procedure TestTypeHelper_String;
     Procedure TestTypeHelper_Boolean;
+    Procedure TestTypeHelper_Double;
     Procedure TestTypeHelper_Constructor_NewInstance;
     Procedure TestTypeHelper_InterfaceFail;
 
@@ -17488,6 +17489,30 @@ begin
   ParseProgram;
 end;
 
+procedure TTestResolver.TestTypeHelper_Double;
+begin
+  StartProgram(false);
+  Add([
+  '{$modeswitch typehelpers}',
+  'type',
+  '  Float = type double;',
+  '  THelper = type helper for float',
+  '    const NPI = 3.141592;',
+  '    function ToStr: String;',
+  '  end;',
+  'function THelper.ToStr: String;',
+  'begin',
+  'end;',
+  'var',
+  '  a,b: Float;',
+  '  s: string;',
+  'begin',
+  '  s:=(a * b.NPI).ToStr;',
+  '  s:=(a * float.NPI).ToStr;',
+  '']);
+  ParseProgram;
+end;
+
 procedure TTestResolver.TestTypeHelper_Constructor_NewInstance;
 var
   aMarker: PSrcMarker;
diff --git a/packages/pastojs/src/fppas2js.pp b/packages/pastojs/src/fppas2js.pp
index dd8ed8538d..b0b37b48c2 100644
--- a/packages/pastojs/src/fppas2js.pp
+++ b/packages/pastojs/src/fppas2js.pp
@@ -18200,7 +18200,7 @@ begin
 
     // append args
     ProcType:=Proc.ProcType;
-    if Expr.Parent is TParamsExpr then
+    if (Expr.Parent is TParamsExpr) and (TParamsExpr(Expr.Parent).Value=Expr) then
       ParamsExpr:=TParamsExpr(Expr.Parent)
     else
       ParamsExpr:=nil;
@@ -21352,7 +21352,7 @@ begin
         begin
         // pass set with argDefault  -> create reference   rtl.refSet(right)
         {$IFDEF VerbosePas2JS}
-        writeln('TPasToJSConverter.CreateProcedureCallArg create reference of SET variable Right={',GetResolverResultDbg(ExprResolved),'} AssignContext.RightResolved.IdentEl=',GetObjName(ExprResolved.IdentEl));
+        writeln('TPasToJSConverter.CreateProcCallArg create reference of SET variable Right={',GetResolverResultDbg(ExprResolved),'} AssignContext.RightResolved.IdentEl=',GetObjName(ExprResolved.IdentEl));
         {$ENDIF}
         Result:=CreateReferencedSet(El,Result);
         end;
@@ -21430,7 +21430,7 @@ begin
               begin
               // pass record with argDefault ->  "TGuid.$clone(RightRecord)"
               {$IFDEF VerbosePas2JS}
-              writeln('TPasToJSConverter.CreateProcedureCallArg clone RECORD TGuid variable Right={',GetResolverResultDbg(ExprResolved),'} AssignContext.RightResolved.IdentEl=',GetObjName(ExprResolved.IdentEl));
+              writeln('TPasToJSConverter.CreateProcCallArg clone RECORD TGuid variable Right={',GetResolverResultDbg(ExprResolved),'} AssignContext.RightResolved.IdentEl=',GetObjName(ExprResolved.IdentEl));
               {$ENDIF}
               Result:=CreateRecordCallClone(El,TPasRecordType(ArgTypeEl),Result,AContext);
               end;
@@ -21499,7 +21499,7 @@ begin
           begin
           // pass record with argDefault ->  "RightRecord.$clone(RightRecord)"
           {$IFDEF VerbosePas2JS}
-          writeln('TPasToJSConverter.CreateProcedureCallArg clone RECORD variable Right={',GetResolverResultDbg(ExprResolved),'} AssignContext.RightResolved.IdentEl=',GetObjName(ExprResolved.IdentEl));
+          writeln('TPasToJSConverter.CreateProcCallArg clone RECORD variable Right={',GetResolverResultDbg(ExprResolved),'} AssignContext.RightResolved.IdentEl=',GetObjName(ExprResolved.IdentEl));
           {$ENDIF}
           Result:=CreateRecordCallClone(El,TPasRecordType(ExprTypeEl),Result,AContext);
           end;
@@ -21623,7 +21623,7 @@ begin
     // ParamContext.Getter is the last part of the FullGetter
     // FullSetter is created from FullGetter by replacing the Getter with the Setter
     {$IFDEF VerbosePas2JS}
-    writeln('TPasToJSConverter.CreateProcedureCallArg VAR FullGetter=',GetObjName(FullGetter),' Setter=',GetObjName(ParamContext.Setter),' ',GetResolverResultDbg(ResolvedEl));
+    writeln('TPasToJSConverter.CreateProcCallArgRef VAR El=',GetObjName(El),' FullGetter=',GetObjName(FullGetter),' Setter=',GetObjName(ParamContext.Setter),' ',GetResolverResultDbg(ResolvedEl));
     {$ENDIF}
 
     // create "{p:path,get:function(){return this.p.Getter},set:function(v){this.p.Setter(v);}}"
@@ -21768,11 +21768,15 @@ begin
     else
       begin
       {$IFDEF VerbosePas2JS}
-      writeln('TPasToJSConverter.CreateProcedureCallArg FullGetter=',GetObjName(FullGetter),' Setter=',GetObjName(ParamContext.Setter));
+      writeln('TPasToJSConverter.CreateProcCallArgRef FullGetter=',GetObjName(FullGetter),' Setter=',GetObjName(ParamContext.Setter));
       {$ENDIF}
       RaiseNotSupported(El,AContext,20170213230336);
       end;
 
+    {$IFDEF VerbosePas2JS}
+    //writeln('TPasToJSConverter.CreateProcCallArgRef GetExpr=',GetObjName(GetExpr),' SetExpr=',GetObjName(SetExpr),' SetterArgName=',SetterArgName);
+    {$ENDIF}
+
     if (SetExpr.ClassType=TJSPrimaryExpressionIdent)
         or (SetExpr.ClassType=TJSDotMemberExpression)
         or (SetExpr.ClassType=TJSBracketMemberExpression) then
@@ -21827,6 +21831,10 @@ begin
     else
       RaiseInconsistency(20170213225940,El);
 
+    {$IFDEF VerbosePas2JS}
+    //writeln('TPasToJSConverter.CreateProcCallArgRef created full SetExpr=',GetObjName(SetExpr),' SetterArgName=',SetterArgName);
+    {$ENDIF}
+
     // add   p:GetPathExpr
     AddVar(TempRefGetPathName,GetPathExpr);
 
diff --git a/packages/pastojs/tests/tcmodules.pas b/packages/pastojs/tests/tcmodules.pas
index 855cfedb1d..981aff4945 100644
--- a/packages/pastojs/tests/tcmodules.pas
+++ b/packages/pastojs/tests/tcmodules.pas
@@ -676,6 +676,7 @@ type
     Procedure TestTypeHelper_ClassMethod;
     Procedure TestTypeHelper_Constructor;
     Procedure TestTypeHelper_Word;
+    Procedure TestTypeHelper_Double;
     Procedure TestTypeHelper_StringChar;
     Procedure TestTypeHelper_Array;
     Procedure TestTypeHelper_EnumType;
@@ -22893,6 +22894,64 @@ begin
     '']));
 end;
 
+procedure TTestModule.TestTypeHelper_Double;
+begin
+  StartProgram(false);
+  Add([
+  '{$modeswitch typehelpers}',
+  'type',
+  '  Float = type double;',
+  '  THelper = type helper for double',
+  '    const NPI = 3.141592;',
+  '    function ToStr: String;',
+  '  end;',
+  'function THelper.ToStr: String;',
+  'begin',
+  'end;',
+  'procedure DoIt(s: string);',
+  'begin',
+  'end;',
+  'var f: Float;',
+  'begin',
+  '  DoIt(f.toStr);',
+  '  DoIt(f.toStr());',
+  '']);
+  ConvertProgram;
+  CheckSource('TestTypeHelper_Double',
+    LinesToStr([ // statements
+    'rtl.createHelper($mod, "THelper", null, function () {',
+    '  this.NPI = 3.141592;',
+    '  this.ToStr = function () {',
+    '    var Result = "";',
+    '    return Result;',
+    '  };',
+    '});',
+    'this.DoIt = function (s) {',
+    '};',
+    'this.f = 0.0;',
+    '']),
+    LinesToStr([ // $mod.$main
+    '$mod.DoIt($mod.THelper.ToStr.call({',
+    '  p: $mod,',
+    '  get: function () {',
+    '      return this.p.f;',
+    '    },',
+    '  set: function (v) {',
+    '      this.p.f = v;',
+    '    }',
+    '}));',
+    '$mod.DoIt($mod.THelper.ToStr.call({',
+    '  p: $mod,',
+    '  get: function () {',
+    '      return this.p.f;',
+    '    },',
+    '  set: function (v) {',
+    '      this.p.f = v;',
+    '    }',
+    '}));',
+    '']));
+end;
+
 procedure TTestModule.TestTypeHelper_StringChar;
 begin
   StartProgram(false);