diff --git a/src/Algorithm/Shamir.php b/src/Algorithm/Shamir.php
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index 145c192..f78e18e 100644
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--- a/src/Algorithm/Shamir.php
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+++ b/src/Algorithm/Shamir.php
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@@ -371,14 +371,14 @@ class Shamir implements Algorithm, RandomGeneratorAware
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protected function unpack(string $string): array
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{
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$chunk = 0;
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- $int = null;
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+ $int = '';
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$return = [];
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foreach (unpack('C*', $string) as $byte) {
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$int = bcadd($int, bcmul($byte, bcpow(2, $chunk * 8)));
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if (++$chunk === $this->chunkSize) {
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$return[] = $int;
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$chunk = 0;
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- $int = null;
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+ $int = '';
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}
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}
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if ($chunk > 0) {
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