diff --git a/src/sas/qtgui/Perspectives/Fitting/FittingUtilities.py b/src/sas/qtgui/Perspectives/Fitting/FittingUtilities.py
index 3ef7cec292..56b932714a 100644
--- a/src/sas/qtgui/Perspectives/Fitting/FittingUtilities.py
+++ b/src/sas/qtgui/Perspectives/Fitting/FittingUtilities.py
@@ -595,7 +595,8 @@ def residualsData2D(reference_data, current_data, weight):
     residuals.qx_data = current_data.qx_data
     residuals.qy_data = current_data.qy_data
     residuals.q_data = current_data.q_data
-    residuals.err_data = None
+    # Slicers expect residuals to have err_data, so add dummy error data of ones
+    residuals.err_data = numpy.ones(len(residuals.data))
     residuals.xmin = min(residuals.qx_data)
     residuals.xmax = max(residuals.qx_data)
     residuals.ymin = min(residuals.qy_data)