Thread: ranging on npc not all cause client crash

when i range some npc the client will crash and displays this error

Code:

java.lang.ArrayIndexOutOfBoundsException: 25087
        at Class106.method1648(Class106.java:89)
        at Class68_Sub13_Sub31.method857(Class68_Sub13_Sub31.java:87)
        at Class68_Sub19.method999(Class68_Sub19.java:165)
        at Class68_Sub19.method999(Class68_Sub19.java:330)
        at Class68_Sub20.method1004(Class68_Sub20.java:57)
        at Class68_Sub13_Sub25.method821(Class68_Sub13_Sub25.java:108)
        at client.method15(client.java:2042)
        at Applet_Sub1.positionGameCanvas(Applet_Sub1.java:458)
        at Applet_Sub1.run(Applet_Sub1.java:169)
        at java.lang.Thread.run(Unknown Source)
Error: Class106:89 Class68_Sub13_Sub31:87 Class68_Sub19:165 Class68_Sub19:330 Cl
ass68_Sub20:57 Class68_Sub13_Sub25:108 client:2042 Applet_Sub1:458 Applet_Sub1:1
69 java.lang.Thread.run | java.lang.ArrayIndexOutOfBoundsException: 25087

how do i fix this because it on all npc's exept the godwars npc's