diff --git a/goon/code/datums/browserOutput.dm b/goon/code/datums/browserOutput.dm
index b073bece409..d901f351785 100644
--- a/goon/code/datums/browserOutput.dm
+++ b/goon/code/datums/browserOutput.dm
@@ -159,6 +159,11 @@ var/list/chatResources = list(
 		return
 
 	if(cookie != "none")
+		var/regex/crashy_thingy = new /regex("(\\\[ *){5}")
+		if(crashy_thingy.Find(cookie))
+			message_admins("[key_name(src.owner)] tried to crash the server using malformed JSON")
+			log_admin("[key_name(owner)] tried to crash the server using malformed JSON")
+			return
 		var/list/connData = json_decode(cookie)
 		if(connData && islist(connData) && connData.len > 0 && connData["connData"])
 			connectionHistory = connData["connData"]