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A variable type check failed, expecting G/INT for 's' : disk - /admin.php?m=cache&s=disk

Since my SeditioTOCotonti migration, my System-log database table is full of this shit... it seems to be a problem in sed_import() function passing values.
At the beginning I thought it was a bad coding in some ported plugins, but, as you can see, this is a admin area problem... and many other entries refer to other core areas of the CMS itself...

What's the matter?
I'm tired of emptying the log every day 'cause the redundant datas in it...