diff --git a/debugger/inspectdlg.pas b/debugger/inspectdlg.pas
index 5dd6ca4690..f2d3bf121f 100644
--- a/debugger/inspectdlg.pas
+++ b/debugger/inspectdlg.pas
@@ -899,6 +899,12 @@ procedure TIDEInspectDlg.EvaluateCallback(Sender: TObject; ASuccess: Boolean;
   ResultText: String; ResultDBGType: TDBGType);
 begin
   FUpdateLock := False;
+  if FUpdateNeeded then begin
+    Clear;
+    UpdateData;
+    exit;
+  end;
+
   FExpressionWasEvaluated := True;
 
   FHumanReadable := ResultText;