call to a member function flush() on null

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When flushing minify cache with W3 total cache I get this error

PHP Fatal error: Call to a member function flush() on null in .../public_html/wp-content/plugins/w3-total-cache/lib/Minify/Minify/Cache/W3TCDerived.php on line 122

I also get it on the get() function in line 106 in the same file.

I use redis cacheing method on all my cacheing

Any ideea how to fix this error?