NoMethodError with empty examples

[AlexeyMatskevich]

❯ crystalball            
I, [2020-06-25T13:58:05.413206 #24937]  INFO -- : Crystalball starts to glow...
Traceback (most recent call last):
	15: from /home/alexeymatskevich/.rbenv/versions/2.7.1/bin/crystalball:23:in `<main>'
	14: from /home/alexeymatskevich/.rbenv/versions/2.7.1/bin/crystalball:23:in `load'
	13: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/bin/crystalball:5:in `<top (required)>'
	12: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.9.2/lib/rspec/core/runner.rb:45:in `invoke'
	11: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/rspec/runner.rb:19:in `run'
	10: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/rspec/runner.rb:72:in `build_prediction'
	9: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/rspec/prediction_builder.rb:17:in `prediction'
	8: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor.rb:30:in `prediction'
	7: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor.rb:44:in `predict!'
	6: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor.rb:44:in `flat_map'
	5: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor.rb:44:in `each'
	4: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor.rb:44:in `block in predict!'
	3: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor/modified_execution_paths.rb:21:in `call'
	2: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor/strategy.rb:12:in `call'
	1: from /home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor/modified_execution_paths.rb:22:in `block in call'
/home/alexeymatskevich/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/crystalball-0.7.0/lib/crystalball/predictor/helpers/affected_example_groups_detector.rb:13:in `detect_examples': undefined method `map' for nil:NilClass (NoMethodError)

There are no tests in my application
crystalball_data.yml:

---
:type: Crystalball::ExecutionMap
:commit: 50c5c73bd645e7f7893a8d50235834331874e233
:timestamp: 1593081312
:version: