diff --git a/gui/wxpython/gmodeler/dialogs.py b/gui/wxpython/gmodeler/dialogs.py
index d47d9791a8b..a7b230ddbc7 100644
--- a/gui/wxpython/gmodeler/dialogs.py
+++ b/gui/wxpython/gmodeler/dialogs.py
@@ -325,8 +325,8 @@ def ValidateCmd(self, cmd):
 
     def OnCommand(self, cmd):
         """Command in prompt confirmed"""
-        if self.ValidateCmd(cmd):
-            self._command = cmd
+        if self.ValidateCmd(cmd["cmd"]):
+            self._command = cmd["cmd"]
             self.EndModal(wx.ID_OK)
 
     def OnOk(self, event):