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-rw-r--r--wqflask/wqflask/marker_regression/display_mapping_results.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/wqflask/wqflask/marker_regression/display_mapping_results.py b/wqflask/wqflask/marker_regression/display_mapping_results.py
index ec17d3b0..2d74ea52 100644
--- a/wqflask/wqflask/marker_regression/display_mapping_results.py
+++ b/wqflask/wqflask/marker_regression/display_mapping_results.py
@@ -861,6 +861,9 @@ class DisplayMappingResults:
                             (item[1], yZero - item[2] * bootHeightThresh / maxBootCount)),
                         fill=self.BOOTSTRAP_BOX_COLOR, outline=BLACK)
 
+        if maxBootCount == 0:
+            return
+
         # draw boot scale
         highestPercent = (maxBootCount * 100.0) / nboot
         bootScale = Plot.detScale(0, highestPercent)