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-rw-r--r--lib/stitch_plan/stitch_plan.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/stitch_plan/stitch_plan.py b/lib/stitch_plan/stitch_plan.py
index caea9c09..68d52699 100644
--- a/lib/stitch_plan/stitch_plan.py
+++ b/lib/stitch_plan/stitch_plan.py
@@ -31,7 +31,7 @@ def stitch_groups_to_stitch_plan(stitch_groups, collapse_len=None, min_stitch_le
if collapse_len is None:
collapse_len = 3.0
- collapse_len = collapse_len * PIXELS_PER_MM
+ collapse_len = float(collapse_len) * PIXELS_PER_MM
stitch_plan = StitchPlan()
color_block = stitch_plan.new_color_block(color=stitch_groups[0].color)