fix excavate bug

[TheTechromancer]

Fixes #1937.

@aconite33

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (0349750) to head (9d48030).
Report is 34 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/core/event/base.py	86%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #1969   +/-   ##
=====================================
- Coverage     93%     93%   -0%     
=====================================
  Files        363     363           
  Lines      27845   27867   +22     
=====================================
+ Hits       25654   25671   +17     
- Misses      2191    2196    +5     

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