diff --git a/experiment_runner/form_matrixgame.pas b/experiment_runner/form_matrixgame.pas
index 3985569..6682bd4 100644
--- a/experiment_runner/form_matrixgame.pas
+++ b/experiment_runner/form_matrixgame.pas
@@ -333,11 +333,12 @@ begin
   ButtonExpCancel.Enabled := not ButtonExpStart.Enabled;
   ButtonExpPause.Enabled := not ButtonExpStart.Enabled;
   FGameControl.Experiment.SaveToFile(OpenDialog.FileName+'.canceled');
-  FGameControl.SendMessage(K_END);
+  FGameControl.Cancel;
 end;
 
 procedure TFormMatrixGame.ButtonExpPauseClick(Sender: TObject);
 begin
+  ShowMessage('Não implementado.');
   //ButtonExpStart.Enabled := True;
   //ButtonExpStart.Caption := CAPTION_RESUME;
   //ButtonExpPause.Enabled := not ButtonExpStart.Enabled;
diff --git a/experiment_runner/units/game_control.pas b/experiment_runner/units/game_control.pas
index 462cf08..de619d9 100644
--- a/experiment_runner/units/game_control.pas
+++ b/experiment_runner/units/game_control.pas
@@ -763,7 +763,9 @@ end;
 
 procedure TGameControl.Cancel;
 begin
-
+  FormMatrixGame.StringGridMatrix.Clean;
+  FormMatrixGame.StringGridMatrix.Options := [];
+  FZMQActor.SendMessage(K_END);
 end;
 
 // Here FActor is garanted to be a TZMQPlayer
diff --git a/experiment_runner/units/game_file_methods.pas b/experiment_runner/units/game_file_methods.pas
index e4b1cbc..49497b7 100644
--- a/experiment_runner/units/game_file_methods.pas
+++ b/experiment_runner/units/game_file_methods.pas
@@ -427,8 +427,11 @@ begin
             WriteInteger(LC, KEY_CYCLES_COUNT,Cycles.Count);
             WriteInteger(LC, KEY_CYCLES_VALUE,Cycles.Value);
             WriteInteger(LC, KEY_CYCLES_GEN,Cycles.Generation);
-            WriteString(LC, KEY_PROMPT_MESSAGE, Prompt.Question);
-            WriteString(LC, KEY_PROMPT_STYLE, GetPromptStyleString(Prompt.PromptStyle));
+            if Assigned(Prompt) then
+              begin
+                WriteString(LC, KEY_PROMPT_MESSAGE, Prompt.Question);
+                WriteString(LC, KEY_PROMPT_STYLE, GetPromptStyleString(Prompt.PromptStyle));
+              end;
 
             MI := 0;
             CI := 0;
--
libgit2 0.21.2