Fix Assertion failed: _lastFuture == null

[rrousselGit]

fixes #2041

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Latest commit: a63e56c

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[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 95.71%. Comparing base (0e297cb) to head (6132603).

❗ Current head 6132603 differs from pull request most recent head a63e56c. Consider uploading reports for the commit a63e56c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3407      +/-   ##
==========================================
+ Coverage   95.67%   95.71%   +0.04%     
==========================================
  Files          53       53              
  Lines        2313     2313              
==========================================
+ Hits         2213     2214       +1     
+ Misses        100       99       -1     

Files	Coverage Δ
...d/lib/src/framework/proxy_provider_listenable.dart	97.14% <75.00%> (ø)

... and 1 file with indirect coverage changes