How to look into your issue

Steps to Debug:

Step 1: Determine what is working
Step 2: Determine precisely what is not working
Step 3: Simplify the problem
Step 4: Generate hypotheses
Step 5: Test hypotheses using divide and conquer
Step 6: Think of other versions of this class of bug
Step 7: Generate anti-regression tests
Step 8: Fix the bug(s)
Step 9: Check that the tests now work
Step 10: Check the original simple case
Step 11: Check the original issue
Step 12: Document the fix
Step 13: Note any other possible bug classes
Step 14: Release
Conclusion
https://hackernoon.com/how-to-debug-any-problem-ac6f8a867fae