Fix log fatal

[johnfercher]

Description

• Fix log fatal

Related Issue

related to #360

Checklist

check with "x", if applied to your change

• All methods associated with structs has func (<first letter of struct> *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Followed the unit test when,should naming pattern.
• Updated docs/doc.go and docs/*
• Updated pkg/pdf/example_test.go
• Updated README.md
• Executed make examples to update all examples inside docs/examples.
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6db89e8) 78.43% compared to head (eb38e68) 78.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #362   +/-   ##
=======================================
  Coverage   78.43%   78.43%           
=======================================
  Files          61       61           
  Lines        2007     2007           
=======================================
  Hits         1574     1574           
  Misses        404      404           
  Partials       29       29           

Flag	Coverage Δ
unittests	78.43% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
maroto.go	79.36% <0.00%> (ø)

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