Taxonomy floods console with output

Going to taxonomies floods the console with output. The UI stops responding while output is written:

Categories : {key_006f4d38-4330-48b6-abb6-d0b98a15c1cd=org.onehippo.taxonomy.plugin.model.JcrCategory@e8209ee7, key_0176195a-8c45-42c3-b4d6-dab56b4f035a=org.onehippo.taxonomy.plugin.model.JcrCategory@36ba5e5e, key_01f3c7f7-3b3a-484d-a922-b1b71501eca7=org.onehippo.taxonomy.plugin.model.JcrCategory@c3b10abd, key_02a8af94-f1fe-4b19-8e9e-3c3a9808698e=org.onehippo.taxonomy.plugin.model.JcrCategory@671f5458, key_035b40bc-5dd0-4327-aaff-918fa699ac12=org.onehippo.taxonomy.plugin.model.JcrCategory@db110b54, key_03688d07-d16b-481c-b41c-f2c3d93c88df=org.onehippo.taxonomy.plugin.model.JcrCategory@4181eab9, key_03c93503-7ee0-4d80-916a-5632e7a09d13=org.onehippo.taxonomy.plugin.model.JcrCategory@b3f0f735, key_077ed588-c363-473b-8086-8b06e10421c9=org.onehippo.taxonomy.plugin.model.JcrCategory@e72acfe3, key_08cd95c4-ffea-48e2-934f-145b01df1886=or