Same problem.
Test results:
OS version: 10.12 (0 seconds)
Current date: Monday, 17 October 2016 at 23:14:47 (0 seconds)
Initialize workflow path: /Users/***/Dropbox/Alfred/Alfred.alfredpreferences/workflows/user.workflow.45E316E4-45AB-4F0B-8A72-FE817C0972C7 (0 seconds)
Initialize alfred-library: OK (0 seconds)
Initialize update-library: OK (0 seconds)
Initialize wf-library: OK (0 seconds)
Initialize plist-library: OK (0 seconds)
Reminders.app state: Running (0 seconds)
Fetch reminder count: 0 (0 seconds)
Fetch reminder info: ERROR: Reminders got an error: Can’t get reminder 1 whose completed = false. Invalid index. (0 seconds)
Fetch reminder list count: 4 (0 seconds)
Fetch reminder list info: OK (1 seconds)
Run cache process: SKIPPED (0 seconds)
Fetch cache timestamp: SKIPPED (0 seconds)
Fetch cached reminder count: SKIPPED (0 seconds)
Test basic query: OK (0 seconds)
Test today query: OK (0 seconds)
Test in n minutes query: OK (0 seconds)
Test in n hours query: OK (0 seconds)
Test in n days query: OK (0 seconds)
Test in n days y hours query: OK (0 seconds)
Test in n hours y minutes query: OK (0 seconds)
Test at time query: OK (0 seconds)
Test tomorrow at time query: OK (0 seconds)
Test in x list query: OK (0 seconds)
Subtitle generation: OK (0 seconds)
Test basic reminder filtering: OK (0 seconds)
Test remind today reminder filtering: OK (0 seconds)
Test due tomorrow reminder filtering: OK (0 seconds)
Test reminder list filtering: OK (0 seconds)
Test version-check response: OK (0 seconds)
Current unix time: 1,476735288E+9 (0 seconds)
Simple JSON: OK (0 seconds)
Test execution time: 1 seconds