Fix issue psalm.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

Base: 98.05% // Head: 98.05% // No change to project coverage 👍

Coverage data is based on head (2b968ab) compared to base (662ccd6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #163   +/-   ##
=========================================
  Coverage     98.05%   98.05%           
  Complexity      321      321           
=========================================
  Files            16       16           
  Lines           976      976           
=========================================
  Hits            957      957           
  Misses           19       19           

Impacted Files	Coverage Δ
src/Schema.php	100.00% <ø> (ø)

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