---
 programs/network/ircc/textbox.inc | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/programs/network/ircc/textbox.inc b/programs/network/ircc/textbox.inc
index c7c47041..7649919e 100644
--- a/programs/network/ircc/textbox.inc
+++ b/programs/network/ircc/textbox.inc
@@ -140,6 +140,30 @@ print_asciiz:
 ;----------------------------------
 print_char:
 
+        cmp     al, 1
+        je      .unsupported_char
+        cmp     al, 2
+        je      .unsupported_char
+        cmp     al, 4
+        je      .unsupported_char
+        cmp     al, 5
+        je      .unsupported_char
+        cmp     al, 6
+        je      .unsupported_char
+        cmp     al, 7
+        je      .unsupported_char
+        cmp     al, 8
+        je      .unsupported_char
+        cmp     al, 9
+        je      .unsupported_char
+        cmp     al, 11
+        je      .unsupported_char
+        cmp     al, 12
+        je      .unsupported_char
+        jmp     .supported_char
+   .unsupported_char:
+        ret
+   .supported_char:
         push    esi edi
         mov     esi, [window_print]
         mov     edi, [esi + window.text_write]
-- 
2.43.2