Conflict between serial communication and wifi

I am using arduino mega and esp 8266 in my project. Mega is used to collect data from different sensors and send data to esp 8266 through UART. Esp 8266 will send this data through wifi to a mqtt server. Everything works fine when it was separate, but when I turn on wifi and uart communication together I didn’t receive any data from arduino mega. There is conflict between uart and wifi communication. Any ideas??

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