Pulse mail - text net.sourceforge.jtds.jdbc.ClobImpl

After setup pulse to send data by email, a part of data (first column in my case) are replaced by a strange texts: net.sourceforge.jtds.jdbc.ClobImpl (on Metabase on Mac OS 10.12.6).
Have you similar results? A workaround is available to solve this issue?

The strange text appears also in the web UI during setting of the Pulse.