fix some uncaught error during runtime test

[t1m0t]

No description provided.

[codecov]

Codecov Report

Merging #230 (eb39f36) into master (f9a5016) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
- Coverage   36.99%   36.96%   -0.04%     
==========================================
  Files          63       63              
  Lines        4876     4880       +4     
==========================================
  Hits         1804     1804              
- Misses       3072     3076       +4     

Impacted Files	Coverage Δ
packages/web/src/dom.rs	0.00% <0.00%> (ø)

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[jkelleyrtp]

Just noticed the failure. Thanks for fixing it :)