refactor: reset ctx when session allocate one

[DarthPestilane]

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[codecov-commenter]

Codecov Report

Merging #31 (52a570f) into master (4768e76) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   96.11%   96.14%   +0.03%     
==========================================
  Files          11       11              
  Lines         360      363       +3     
==========================================
+ Hits          346      349       +3     
  Misses          7        7              
  Partials        7        7              

Impacted Files	Coverage Δ
router.go	100.00% <100.00%> (ø)
router_context.go	100.00% <100.00%> (ø)
session.go	100.00% <100.00%> (ø)

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