Hi @apasionados,
I face the same problem as @fotogaaf on two different sites.
I managed to solve this problem by applying the solution proposed by you:
Change line 29 of the file wpshore_cf7_lead_tracking.php from:
if (!session_id()) {
to
if (!session_id() && !headers_sent()) {
Can you please apply this fix in the next version?
Best regards from Romania.
