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-rw-r--r--wqflask/wqflask/marker_regression/marker_regression.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/wqflask/wqflask/marker_regression/marker_regression.py b/wqflask/wqflask/marker_regression/marker_regression.py
index 087b95b4..c189fb96 100644
--- a/wqflask/wqflask/marker_regression/marker_regression.py
+++ b/wqflask/wqflask/marker_regression/marker_regression.py
@@ -114,7 +114,7 @@ class MarkerRegression(object):
self.num_perm = 0
self.perm_output = []
self.bootstrap_results = []
- self.covariates = start_vars['covariates']
+ self.covariates = start_vars['covariates'] if "covariates" in start_vars else None
#ZS: This is passed to GN1 code for single chr mapping
self.selected_chr = -1