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    <p>This is caused by a corrupt entry in the variables table. The value of this table is a serialized php value.</p> <p>See those for more information on what a serialize value is:</p> <ul> <li><a href="http://php.net/serialize" rel="nofollow">http://php.net/serialize</a></li> <li><a href="http://php.net/unserialize" rel="nofollow">http://php.net/unserialize</a></li> </ul> <p>Basically, if one of the value was changed by hand, it can cause something like this.</p> <p>For example, the default value of the Anonymous variable is:</p> <pre><code>+-----------+------------------+ | name | value | +-----------+------------------+ | anonymous | s:9:"Anonymous"; | +-----------+------------------+ </code></pre> <p>If you change the value to <code>s:9:"Some other value";</code> then this will cause a problem. The first character is the type of value. The value <code>s</code> means STRING. Then the colon followed by a number indicate a length. In this case, the word <code>Anonymous</code> is exactly 9 characters. But there is more than 9 characters for <code>Some other value</code>. There are 16 characters in that value, so the correct way would be <code>s:16:"Some other value";</code>.</p> <p>If someone put the value not serialized (without the <code>s:9:"";</code>) then it would also cause this problem.</p> <p>I had this very problem in the past. I added some debug code to find out what variable was causing this. I added something like this:</p> <pre><code>$value = unserialize($variable-&gt;value); if ($value === FALSE) { watchdog('unserialize', $variable-&gt;name); } </code></pre> <p>I put this code right before the line causing the error and then I generated the error one more time and I went to the "Recent Log Entries" in Drupal admin <code>http://yoursite.com/admin/reports/dblog</code> and filtered by the type <code>unserialize</code>.</p> <p>Once I had the name of the variable, I would connect to the database and perform this query:</p> <p><code>SELECT * FROM variable WHERE name='name-goes-here';</code></p> <p>and I put the name that I found in the logs. I look at the value and figure out why it is causing this error and then fix the value.</p> <p>I hope this helps.</p>
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    1. PONotice: unserialize() [function.unserialize] in Drupal
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    1. COIt won't necessarily by the variable table, Drupal serialises quite a lot of stuff
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    2. CO@Clive: True that, but the line number and filenamne he gave is very close to `$variables[$variable->name] = unserialize($variable->value);`
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    3. CO@roychris My bad I didn't bother to look! +1 for your nicely in-depth answer
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