Checkin Count API call is failing with 500 Error

[therebelrobot]

installation: codeforsanfrancisco.org
relevant logs:

Jan 26 14:26:55 sfbrigade app/web.1:  TypeError: Cannot convert undefined or null to object 
Jan 26 14:26:55 sfbrigade app/web.1:      at req.mrt.result.req.mrt.result.map (/app/node_modules/brigadehub-core/helpers/mortimer/checkinResource.js:14:23) 
Jan 26 14:26:55 sfbrigade app/web.1:      at Array.map (native) 
Jan 26 14:26:55 sfbrigade app/web.1:      at /app/node_modules/brigadehub-core/helpers/mortimer/checkinResource.js:12:39 
Jan 26 14:26:55 sfbrigade app/web.1:      at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5) 
Jan 26 14:26:55 sfbrigade app/web.1:      at next (/app/node_modules/express/lib/router/route.js:131:13) 
Jan 26 14:26:55 sfbrigade app/web.1:      at req.(anonymous function).query.exec (/app/node_modules/mortimer/lib/Resource.js:524:24) 
Jan 26 14:26:55 sfbrigade app/web.1:      at Query.<anonymous> (/app/node_modules/mongoose/lib/query.js:2180:28) 
Jan 26 14:26:55 sfbrigade app/web.1:      at /app/node_modules/kareem/index.js:177:19 
Jan 26 14:26:55 sfbrigade app/web.1:      at /app/node_modules/kareem/index.js:123:27 
Jan 26 14:26:55 sfbrigade app/web.1:      at Promise.all.then (/app/node_modules/brigadehub-core/models/Checkins/index.js:39:5) 
Jan 26 14:26:55 sfbrigade app/web.1:      at process._tickCallback (internal/process/next_tick.js:103:7) 
Jan 26 14:26:55 sfbrigade app/web.1:  GET /api/checkins?date__gt=1484951199740 500 98.443 ms - - 

Will pull a copy of the checkins db to inspect for malformed data.