We encountered cases where HydPy-Musk-MCT calculated nan values for extremely small reference discharge values. We could fix this problem by increasing the precision of the iterative search for the corresponding reference water level (based on the Pegasus method). Hence, this bugfix release should not only avoid the nan value problem but might also result in slightly different (typically slightly more precise) results during low flow periods compared to previous releases. Please have a look at #162 for more information.