"base" as feature name causes NaN error on campaign.fit()

[Stonemansrs]

Input Data Error: Input data contains NaN values.
Occurs at campaign.fit() after adding data containing a feature named "base"
Renaming the feature to anything else, including "Base" fixes this issue.
The issue occurs in both app and jupyter notebook. App error occurs on press of "fit" of the optimize tab which matches the campaign.fit() call.