diff --git a/components/fpdebug/fppascalparser.pas b/components/fpdebug/fppascalparser.pas
index 82e98f022a..3fa7c507ca 100644
--- a/components/fpdebug/fppascalparser.pas
+++ b/components/fpdebug/fppascalparser.pas
@@ -2119,6 +2119,7 @@ end;
 function TFpPascalExpressionPart.DoGetResultValue: TFpValue;
 begin
   Result := nil;
+  SetError('Can not evaluate: "'+GetText+'"');
 end;
 
 procedure TFpPascalExpressionPart.ResetEvaluation;
diff --git a/components/lazdebuggers/lazdebuggerfp/test/testwatches.pas b/components/lazdebuggers/lazdebuggerfp/test/testwatches.pas
index 162d3c1cb0..a9e5915b14 100644
--- a/components/lazdebuggers/lazdebuggerfp/test/testwatches.pas
+++ b/components/lazdebuggers/lazdebuggerfp/test/testwatches.pas
@@ -22,6 +22,7 @@ type
     procedure TestWatchesAddressOf;
     procedure TestWatchesTypeCast;
     procedure TestWatchesExpression;
+    procedure TestWatchesErrors;
   end;
 
 implementation
@@ -29,7 +30,7 @@ implementation
 var
   ControlTestWatch, ControlTestWatchScope, ControlTestWatchValue,
   ControlTestWatchAddressOf, ControlTestWatchTypeCast,
-  ControlTestExpression: Pointer;
+  ControlTestExpression, ControlTestErrors: Pointer;
 
 procedure TTestWatches.RunToPause(var ABrk: TDBGBreakPoint);
 begin
@@ -2176,6 +2177,62 @@ begin
 
 
 
+  finally
+    t.Free;
+    Debugger.ClearDebuggerMonitors;
+    Debugger.FreeDebugger;
+
+    AssertTestErrors;
+  end;
+end;
+
+procedure TTestWatches.TestWatchesErrors;
+var
+  ExeName: String;
+  t: TWatchExpectationList;
+  Src: TCommonSource;
+  BrkPrg, BrkFoo, BrkFooVar, BrkFooConstRef: TDBGBreakPoint;
+begin
+  if SkipTest then exit;
+  if not TestControlCanTest(ControlTestErrors) then exit;
+  t := nil;
+
+  Src := GetCommonSourceFor('WatchesValuePrg.Pas');
+  TestCompile(Src, ExeName);
+
+  AssertTrue('Start debugger', Debugger.StartDebugger(AppDir, ExeName));
+
+  try
+    t := TWatchExpectationList.Create(Self);
+    t.AcceptSkSimple := [skInteger, skCardinal, skBoolean, skChar, skFloat,
+      skString, skAnsiString, skCurrency, skVariant, skWideString,
+      skInterface];
+    t.AddTypeNameAlias('integer', 'integer|longint');
+    t.AddTypeNameAlias('ShortStr255', 'ShortStr255|ShortString');
+    t.AddTypeNameAlias('TEnumSub', 'TEnum|TEnumSub');
+
+    BrkPrg         := Debugger.SetBreakPoint(Src, 'Prg');
+    //BrkFoo         := Debugger.SetBreakPoint(Src, 'Foo');
+    //BrkFooVar      := Debugger.SetBreakPoint(Src, 'FooVar');
+    //BrkFooConstRef := Debugger.SetBreakPoint(Src, 'FooConstRef');
+    AssertDebuggerNotInErrorState;
+
+    (* ************ Nested Functions ************* *)
+
+    RunToPause(BrkPrg);
+
+    t.Clear;
+    // Constant values
+    //t.Add('', '^char(1)^+[1]',   weMatchErr('Can not evaluate: "\[1\]"'));
+    t.Add('', '^char(1)^+[1]',   weMatchErr('Can not evaluate: "\['));
+
+
+    t.EvaluateWatches;
+    t.CheckResults;
+
+
+
+
   finally
     t.Free;
     Debugger.ClearDebuggerMonitors;
@@ -2194,6 +2251,8 @@ initialization
   ControlTestWatchAddressOf := TestControlRegisterTest('AddressOf', ControlTestWatch);
   ControlTestWatchTypeCast  := TestControlRegisterTest('TypeCast', ControlTestWatch);
   ControlTestExpression     := TestControlRegisterTest('Expression', ControlTestWatch);
+  ControlTestErrors         := TestControlRegisterTest('Errors', ControlTestWatch);
 
 end.
 
+
diff --git a/components/lazdebuggers/lazdebugtestbase/ttestwatchutilities.pas b/components/lazdebuggers/lazdebugtestbase/ttestwatchutilities.pas
index 5b8299bfa7..489c63bd90 100644
--- a/components/lazdebuggers/lazdebugtestbase/ttestwatchutilities.pas
+++ b/components/lazdebuggers/lazdebugtestbase/ttestwatchutilities.pas
@@ -38,6 +38,7 @@ type
 
      ehExpectNotFound,
      ehExpectError,       // watch is invalid (less specific, than not found / maybe invalid expression ?)
+     ehExpectErrorText,   // watch is invalid // still test for Expected test
 
      ehNotImplemented,     // The debugger is known to fail this test // same as ehIgnAll
      ehNotImplementedKind, // skSimple...
@@ -286,6 +287,7 @@ type
 
 
 function weMatch(AExpVal: String; ASymKind: TDBGSymbolKind; ATypeName: String=''): TWatchExpectationResult;
+function weMatchErr(AExpVal: String): TWatchExpectationResult;
 
 function weInteger(AExpVal: Int64; ATypeName: String=#1; ASize: Integer = 4): TWatchExpectationResult;
 function weCardinal(AExpVal: QWord; ATypeName: String=#1; ASize: Integer = 4): TWatchExpectationResult;
@@ -407,6 +409,15 @@ begin
   Result.ExpTextData := AExpVal;
 end;
 
+function weMatchErr(AExpVal: String): TWatchExpectationResult;
+begin
+  Result := Default(TWatchExpectationResult);
+  Result.ExpResultKind := rkMatch;
+  Result.ExpSymKind := skNone;
+  Result.ExpTextData := AExpVal;
+  Result.AddFlag(ehExpectErrorText);
+end;
+
 function weInteger(AExpVal: Int64; ATypeName: String; ASize: Integer
   ): TWatchExpectationResult;
 begin
@@ -1259,6 +1270,11 @@ begin
         Result := TestTrue('TstWatch.value is NOT valid', WatchVal.Validity in [ddsError, ddsInvalid], Context, AnIgnoreRsn);
         exit;
       end;
+      if ehExpectErrorText in ehf then begin
+        Result := TestTrue('TstWatch.value is NOT valid', WatchVal.Validity in [ddsError, ddsInvalid], Context, AnIgnoreRsn);
+        Result := CheckData(Context, AnIgnoreRsn);
+        exit;
+      end;
       if ehExpectNotFound in ehf then begin
         Result := TestMatches('TstWatch.value NOT found', 'not found', WatchVal.Value, Context, AnIgnoreRsn);
         Result := TestTrue('TstWatch.value NOT found', WatchVal.Validity in [ddsError, ddsInvalid], Context, AnIgnoreRsn);