🐛 Fixed so that it does not panic even if the error is nil

pretty.go

@@ -60,7 +60,7 @@ func (l *prettyLogger) logWithError(msg string, level zapcore.Level, err error,
 	err2 := l.Logger.Output(
 		4,
 		l.coloredLevel(level).String()+" "+l.coloredMsg(
-			fmt.Sprintf("%s%s%s", msg, separator, au.Magenta(err.Error())),
+			fmt.Sprintf("%s%s%s", msg, separator, au.Magenta(fmt.Sprintf("%v", err))),
 			level, fields,
 		),
 	)

pretty_test.go

@@ -235,6 +235,16 @@ func Test_prettyLogger_logWithError(t *testing.T) {
 		l.logWithError("test message", zapcore.InfoLevel, errors.New("some error"), nil)
 		assert.Contains(t, buf.String(), "[INTERNAL ERROR] ")
 	})
+
+	t.Run("when error is nil", func(t *testing.T) {
+		outputType = PrettyOutput
+		severityLevel = zapcore.DebugLevel
+
+		var buf bytes.Buffer
+		l := newPrettyLogger(&buf, os.Stderr)
+		l.logWithError("test message", zapcore.InfoLevel, nil, nil)
+		assert.Contains(t, buf.String(), "<nil>")
+	})
 }
 
 func Test_prettyLogger_coloredLevel(t *testing.T) {