diff --git a/virtManager/create.py b/virtManager/create.py
index bb556fc63..8f5a10485 100644
--- a/virtManager/create.py
+++ b/virtManager/create.py
@@ -1403,7 +1403,7 @@ class vmmCreate(vmmGObjectUI):
             if variant:
                 guest.os_variant = variant
         except ValueError, e:
-            self.err.show_err(_("Error setting OS information."), e)
+            self.err.show_err(_("Error setting OS information."), str(e))
             return None
 
         if guest.os.is_arm64():
diff --git a/virtManager/error.py b/virtManager/error.py
index 30fc67e3a..5a838f71d 100644
--- a/virtManager/error.py
+++ b/virtManager/error.py
@@ -89,6 +89,8 @@ class vmmErrorDialog(vmmGObject):
             tb = "".join(traceback.format_exc()).strip()
             if tb != "None":
                 details += "\n\n" + tb
+        else:
+            details = str(details)
 
         if debug:
             debugmsg = "error dialog message:\nsummary=%s" % summary