Crashed when receiving sflow data

Hi all,   My ntop suddently crashed when receiving sflow data a while from a router switch (EX4200). The following errors were recoded before ntop dead. flow_sample_element length error (expected 83, found 84)
flow_sample length error (expected 123, found 124)
flow_sample_element length error (expected 2976436, found 4)
flow_sample_element length error (expected 2032393599, found 4)
flow_sample_element length error (expected 2027487209, found 4)
flow_sample_element length error (expected -654233268, found 4)
undefined headerProtocol = 145172546   Anyone know what has happened?   FYI , my ntop version is 3.3.8 running in FC9.    Thanks!   Chor Keung Li 

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