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-rw-r--r--klippy/gcode.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/klippy/gcode.py b/klippy/gcode.py
index 5461ffc8..be45d28f 100644
--- a/klippy/gcode.py
+++ b/klippy/gcode.py
@@ -83,7 +83,7 @@ class GCodeParser:
cmd, key, value, prev_key))
if value in prev_values:
raise error("mux command %s %s %s already registered (%s)" % (
- cmd, key, value))
+ cmd, key, value, prev_values))
prev_values[value] = func
def set_move_transform(self, transform):
if self.move_transform is not None: