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-rw-r--r--gerber/render.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/gerber/render.py b/gerber/render.py
index 8accf09..c6f086a 100644
--- a/gerber/render.py
+++ b/gerber/render.py
@@ -41,8 +41,8 @@ class GerberCoordFormat(object):
self.y_int_digits, self.y_dec_digits = [int(d) for d in y]
def resolve(self, x, y):
- new_x = x.replace("+", "")
- new_y = y.replace("+", "")
+ new_x = x.replace("+", "") if x else None
+ new_y = y.replace("+", "") if y else None
if new_x is not None:
negative = "-" in new_x