Notice: Undefined offset

[perm73]

Hola, gracias por tu información.
Efectivamente, tengo un caso en el que el indice 13 y 15 NO existe. Ya estoy entendiendo el error (no se mucho programación)
Pero también tengo un caso en que sí existe el índice y me sale el error.
¿Que puedo hacer para evitar ese mensaje de error ? o ¿que puedo hacer para resolver el problema?
Notice: Undefined offset: 13 in /var/www/vhosts/...../httpdocs/...../......php on line 9633

Notice: Undefined offset: 15 in /var/www/vhosts/...../httpdocs/...../......php on line 9633
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Notice: Undefined offset: 15 in /var/www/vhosts/...../httpdocs/...../......php on line 9633
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