--- a/src/plugins/irc/irc-ctcp.c
+++ b/src/plugins/irc/irc-ctcp.c
@@ -510,7 +510,7 @@
     int length;
 
     length = strlen (filename);
-    if (length > 0)
+    if (length > 1)
     {
         if ((filename[0] == '\"') && (filename[length - 1] == '\"'))
             return weechat_strndup (filename + 1, length - 2);