fix Uncaught TypeError: webComponentRef.current is null

[JochenDiekenbrock]

In some cases, I see the error Uncaught TypeError: webComponentRef.current is null. The fix avoids this.

[codecov-io]

Codecov Report

Merging #9 (b8ef482) into master (e4211cf) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master        #9   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           54        55    +1     
  Branches         9        10    +1     
=========================================
+ Hits            54        55    +1     

Impacted Files	Coverage Δ
src/index.tsx	100.00% <100.00%> (ø)

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