PHP Error: unserialize() [function.unserialize]: Error at offset 118 of 512

Lately I got this error in my script while trying to decode serialized UTF-8 string:

unserialize() [function.unserialize]: Error at offset 118 of 512

Here's a simple solution I found.

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Source: http://de77.com/php/php-error-unserialize-function-unserialize-error-at-offset-118-of-512