Fix issue psalm.

[terabytesoftw]

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

[codecov]

Codecov Report

Base: 97.61% // Head: 97.61% // No change to project coverage 👍

Coverage data is based on head (30160cf) compared to base (9ba8f8d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #132   +/-   ##
=========================================
  Coverage     97.61%   97.61%           
  Complexity      191      191           
=========================================
  Files            15       15           
  Lines           587      587           
=========================================
  Hits            573      573           
  Misses           14       14           

Impacted Files	Coverage Δ
src/Schema.php	99.61% <ø> (ø)

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