[horde] PHP ERROR: Cannot modify header information - clarification.

[ANANT S ATHAVALE]

Dear List,

Getting the following warning in Horde logs multiple times.

Mar 17 2014 09:01:09 WARN: HORDE [horde] PHP ERROR: Cannot modify  
header information - headers already sent [pid 8820 on line 0 of  
"Unknown"]


Is this warning ignorable?

-- 
           Regards
            Anant
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